Steve sails aboard the S.S. Carolina in order to establish a business contract with a firm but his task is complicated by Robbie who has a vacationing job as a steward onboard the same liner. They both find that business and pleasure do sometimes mix.

Robbie and Ernie find that women are full of surprises and not all of them pleasing. Robbie tires of his noisy rock and roll girlfriend and switches to a more dignified girl who has no time for the childish pursuits of her peers, such as football and sock hops. And unfortunately for Robbie Douglas, Lorraine is also serious about getting married and before he knows it, he's engaged! Can even the sagacious Steve Douglas find a graceful way out of this mess?

Realising the need for economy, Mike and Sally decide that her shower will be productive of useful gifts for the kitchen, but Bub is all for romance but Mike's practical ideas meet resistance when Bub plans a bridal shower for Sally. Chip and Ernie manage to turn the shower into something very impractical indeed.

Bub decides to use his winning raffle ticket to take the Douglases to Ireland to visit his relatives. While in the village of Farnsea, they stay with his redoubtable 103 year old Aunt Kate and Cousin Mickey.

The Douglas family continues to revel in the fun in the Irish village of Farnsea, ruled by the formidable Aunt Kate. Steve realises that her wisdom is helpful when Mary Kathleen Connolly becomes infatuated with him.

Steve brings a business associate home for a quiet weekend of work, forgetting a prior commitment to the Cub Scouts where he has promised to lead the Moose patrol. He frees himself to do a rush design job while the hopeless Mr. Summers learns painfully what it means to be a moose.

Political overtones arise in the Douglas house when Steve becomes escort to a visiting congresswoman. Meanwhile Chip must entertain a small girl who aims to be class president -- even though Chip is campaigning to be.

Chip and Ernie get an interesting lesson in honesty, and dishonesty from the school bully, who volunteers an insight to the underbelly world of swiping school lunches. Chip becomes bewildered by the differing standards of honesty among those he knows and Steve must do his best to sort out the problem.

Mike's life is complicated by the return of his old girlfriend Jean Pearson. He can't bring himself to tell her that he is engaged to marry Sally. Chip and Ernie keep Mike under surveillance to report to fiancee Sally.

Robbie's new girlfriend offers to get him and his guitar an audition at a club, and introduces him to a strange new world of far out youngsters who comprise the audience. When Robbie becomes a smash his family struggles to bring him back from stardom.

At the Lotus Blossom Cafe, Steve is impressed by the timid and beautiful proprietress. The elegant Chinese widow contemplates returning to Hong Kong, but the Douglas family show her the American way of life, hoping she will stay.

Robbie consults Sally about his latest heartthrob—and he's sure he's too young for the girl. Robbie alarms Sally when he appears to be in love with her, and Steve must persuade him to grow up overnight.

After acting as the subject for a stage hypnotist, Robbie decides that hypnosis could help in his latest romance, which leads to a chain reaction when they try it out on his grandfather Bub who consequently does a weird dance whenever someone whistles.

It's a comedy of errors when Mike sets out to make an impression on his future father-in-law when Sally's father returns from an archeological expedition. Mike is unnerved about meeting him but practically kills him with a little too much kindness and enthusiasm.

Robbie breaks a leg on the football field and becomes the first patient of a dazzling French nurse. Robbie doesn't mind being hospitalized when the nurse in training lavishes attention on him. Her constant attention baffles Steve until he is warned that her interest in him is more than in her patient.

When their best friends' marriage heads for the rocks, Mike and Sally pause for a second thought about their forthcoming wedding. Mike and Sally try to reconcile them by arranging visits to a marriage counsellor.

Bub decides to leave for an Irish holiday to help his formidable Aunt Kate celebrate her 104th Birthday in Dublin. Son-in-law Steve eagerly offers to do the housekeeping, rashly declaring that if all women organised their work efficiently, it could be done in just a fraction of the usual time. A belief which is hardly borne out by his own demonstrations.

With Bub permanently away in Ireland, Steve finally resorts to domestic assistance and the Douglas home is afflicted with a fiery dragon of a housekeeper named Fedocia. When Steve is desperately trying to solve the problem of getting rid of her the situation is saved by the arrival of Bub's younger brother Charley, a recently retired Ship's cook on leave. With Steve away on business and Charley about to leave for San Francisco, Chip is unhappy that he won't have a parent to come to his school's Open Night. The family soon learns that Charley's crusty disposition masks a soft heart.

A young engineer finds his lost half-Korean daughter who is staying temporarily at the Douglas House. But Uncle Charley finds that she exhibits more the cunning of the orphanage where she was found than the wisdom of the orient.

Robbie follows the fad and buys an antique aircraft to impress his new girlfriend. Steve lets him go ahead with trying to restore it, convinced it will never fly but as it becomes more airworthy, Steve becomes concerned.

Robbie's glamorous girlfriend invites him to the exotic Brookdale Country Club, and he resolves to put pressure on Steve to join, despite the fact that his father isn't much of a joiner.

A top woman pilot is preparing for her flight around the world and calls on Steve Douglas to modify the design of her plane. Steve takes more than a professional interest in the plane he is preparing for a long solo journey—as well as the lady aviator planning to fly it.

Steve's plan for an Hawaiian holiday is cancelled when Chip develops a case of bronchitis, so Charley and the boys plan to bring Hawaii to him in the form of a luau in the garden complete with ladies that he would undoubtedly have met on board ship.

Chip dates an older woman and Robbie finds his ideas misinterpreted when the Douglas boys face the troubles of growing up. Meanwhile, Robbie tries to come up with a novel idea for the school float, and proceeds to demonstrate that teenage is just a time in life, but his speech, activities and clothes prove that it something much more, a lesson Chip also begins to learn.

To avoid being absent from the family longer than neccessary, Steve declines an invitation to stay at a luxurious mansion in Mexico. So his host flies down the entire family, giving Robbie the opportunity for a few sharp lessons in the conservatism of old Spanish chaperoning customs.

Charley accompanies Robbie and his date to a reading by an old pal of his, Maggie McSterling. She is a veteran actress and she and Charley recall their friendship during their vaudeville days. Maggie looks much younger than her age, and decides that Charley needs a vigorous course of rejuvenation.

Steve is to show important engineering plans to a British scientist on a rush visit to the United States. But soon disappearing blueprints and home-baked cookies can't both be blamed on Steve's absent-mindedness - they become a plaything for Tramp and his friends.

Robbie's friend has a grandfather that trains horses, but on the day of the big race when the thoroughbred racehorse loses her mascot, a rabbit, she loses her speed. But once she hears Robbie serenade on the guitar, the mascot problem is solved.

Chip feels left out of things when he is the only member of the family not working either full or part time. But watching 'Davy Crockett' and dreaming gives him a remarkable solution to his problem - he takes in a partner in his trapping business.

Steve is having nightmares and his vision of the future has a computer named Betsy join the family. It interferes with wedding plans when it selects different mates for Mike and Sally. Hoping to prove the computer wrong, Mike decides he will have Steve fill out a questionaire for his dad and his mother. His reasoning is that they will submit the two forms and the computer will pick someone else for their perfect match, thereby proving to Sally how wrong the computer can be. But lo and behold the computer mates Steve and Mike's mom.

Tramp causes confusion in two households when he runs away from home for fear of a cat. Meanwhile pampered 'Prince', pet in the mansion of a rich socialite, undergoes a complete and mysterious personality change.

Charley has a visit from an old Australian acquaintance who quickly fires the boys' imagination with tales of a paradise in the South pacific. The adults wonder if he is in fact an expert confidence trickster as he cheats Charley with an unexpected legacy that is responsible for a trip to the tropical island of Cocoa Fuji for Uncle Charley, Robbie and Chip.

Chip meets a group of Vaudevillians at a black tie affair with Uncle Charley and loses his sneaker in a Cinderella-like adventure when he falls for little Alice Vail.

Preparations for Mike and Sally's coming nuptials get confusing when Sally's mother arrives two months early and takes over organising for their wedding. The daunting list of chores she hands Mike sends him off into a dream world as he and Sally imagine how other cultures decide who can wed.

Charley refuses to believe that a polite and quietly dressed man is in fact the last Chief of Owahnanee Tribe and his disbelief is deepened when the Indian asks for permission to visit their Tribal Burial grounds which just happens to be the backyard of the Douglas House.

Mike and Sally finally get married and leave for the East where Mike has a job as an assistant college psychology instructor. Robbie happily moves into Mike's old room. When Uncle Charley notes that they may soon be calling Steve 'Grandpa' he becomes somwehat concerned about growing old and calls up his former girlfriends. Robbie, now a college man, offers to help his father make friends with younger women, and while pretending to be disinterested, tries a few of his suggestions. When it is learned that Ernie must return to an orphanage, because he will not be allowed to accompany his foster parents in their move to the orient, Chip invites Ernie to move in permanently, giving Steve three sons once more.

Steve explores the possibility of adopting 10-year-old Ernie but runs into antagonism from Uncle Charley, who can forsee nothing but more work with a new boy to take care of. The family desperately wants to adopt the boy and Robbie decides that Steve must make a play for the lovely Miss Coulter. Her boss comes to inspect the house just as the boys have made a shambles of the place. At eight the next morning, Miss Miller returns. She inspects the house, spic and span now, and ushers in a happy Ernie, who is to stay on a temporary basis.

Ernie's adoption into the all-male Douglas household is threatened by a regulation that there must be a lady of the house. Steve again makes a request to adopt the child, but Misses Coulter and Miller of the adoption agency, say they are powerless to change the regulations. Miss Miller has a brilliant idea, however, and soon the family is appearing before a judge who decides that housekeeper Uncle Charley can legally be designated the 'lady of the house'. Charley approves if this fact is kept secret and Ernie is enthusiastically welcomed into the family.

Uncle Charley is upset when he learns that Robbie is dating a flashy chorus girl, but Steve refuses to worry because he trusts his son's common sense. Charley predicts Steve will be invited to pay the girl cash on the line if he wants her to stop dating his son.

An escaped circus lion makes a midnight call at the Douglas house, and Ernie sees it and awakens the understandably skeptical Steve who accompanies his new stepson to investigate. Steve eventually sees the lion and nervously plays a game of tag with it, warning the family to keep their bedroom doors closed.

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Chip's secret love is an older girl named Mary Lou. When Steve suggests his love sick son should find out where he stands by asking for a date, Chip calls and identifies himself as 'Douglas'. Mary Lou is delighted -- thinking she is going out with Robbie Douglas, a genuine college freshman.

Ernie writes a play and volunteers Steve's services for his father-and-son night, so he dons a heavy robot costume. The family leaves early, and Steve finds himself alone on the street, helpless in his non-removable suit.

A seductive dance instructor named Helen signs Uncle Charley up for a lifetime membership in a dance club. Dreaming of a professional dancer's career, he purchases a top hat and tails for his appearance at the school's annual ball.

Robbie is so eager to make the track team that, to improve his timing, he agrees to join a ballet class. He proves an unwilling pupil, self-conscious in dancer's tights and ballet shoes, but after days of practising, his hurdling style suddenly improves. Reluctantly, he agrees to become the sole male dancer in the upcoming Ballet Class recital.

Ernie feels neglected when the other members of the Douglas family are busy with various girlfriends and he is left alone. Close to tears, Ernie is puzzled and saddened by the mysterious powers of the opposite sex. He's even more puzzled when he meets eleven year old Linda-Lou.

Steve Douglas turns a business trip to Hong Kong into a vacation for the whole family. Uncle Charley, who once lived in China, is reluctant to visit modern Hong Kong, for apparently he still carries a torch for a beautiful girl he knew in the 1930s.

Steve's unusual behaviour convinces his family that he is about to be secretly married. The boys plan to leave home to provide privacy for the newlyweds, and Charley arranges to ship out on a freighter. Steve brings the pretty blonde girl home to meet the family, only to find the house deserted.

The Douglas family bravely accepts the challenge when 13 year old Chip decides to give a party -- with girls. On the party evening the record player breaks down and Chip contemplates the disintegration of his first teenage party. But Steve comes up with a solution.

When Steve travels to Washington on business, he leaves $50 with Robbie, to pay for golf club repairs but Uncle Charley limbers up his billiard cue to get revenge after two girl pool sharks take Robbie's $50 when they coyly ask him to show them how to play the game.

A huge shaggy stray dog adopts Steve Douglas and disrupts the neighborhood with his howls when Steve tries to leave home. A neighbor and lover of stray animals, is delighted to learn that Steve plans to keep the dog until its owner can be found, rather than sending it to a shelter. However, the dog continues to regard Steve as his mother as well as his master.

Steve Douglas meets recently divorced Maggie Bellini, reputed to be one of the world's ten richest women. She sets her sights on Steve by showering his family with costly gifts. Robbie has the use of an experimental sports car, Chip is invited to fly to Austria for a weekend of skiing, and Ernie is provided with the use of a computer for his arithmetic homework.

When Robbie Douglas yanks pretty co-ed Terri Wong out of the path of a speeding truck, he becomes the unwilling beneficiary of an old Chinese custom when the girl whose life he saves insists on being his slave. The game is amusing at first but before long Robbie must ask his father for help.

Steve Douglas is attracted to a beautiful female explorer who shows Steve and the family her exciting adventure films. She has to prepare for a safari, and as there is room in the party for one more, she begs Steve to come along.

Robbie takes on a heavy work load of waiting on tables in his girlfriend's sorority house and working as a chemistry laboratory worker, so that he can rent a room away from home. Worst of all, his romance with his current girlfriend languishes because he is too tired to take her on a date.

When Chip adopts a Beatle-style, shoulder length haircut, the other members of the family feel that Steve should lay down the law to the long-haired one, but he and his associate consult a company psychologist for a solution. Steve decides not to be a strict father but to give the boy more attention, without affect.

Robbie Douglas is practically engaged to his girlfriend Joanne, and when they discover how their friends are both successfully attending university while raising a baby they begin to think that perhaps teen-aged marriages are workable.

Two tomboys - a pretty lady engineer named Max and a member of the girls Hockey team named Georgie prove tough to handle for both Steve and Chip. Hoping to become a hero to his peers, Chip goes out for the girls hockey team when Georgie insists the coach must let her join the boy's track team.

Robbie Douglas learns how much of a pest a younger sibling can be when Chip and a buddy break up his date with a pretty girl by eating appetizers and otherwise making a nuisance of themselves. The next afternoon, for revenge, Robbie primes his other brother Ernie to haunt Chip and his date.

Robbie has a wonderful time going steady with two girls simultaneously -- a highschooler and a college co-ed -- until the two ladies compare notes one day and plot immediate revenge. They maneuver Robbie into dating the both of them on the same night.

Ernie Douglas sends a letter to the French Embassy to thank France for the Statue of Liberty and receives, in return, an invitation for him and the rest of the family to visit Washington, the nation's capital. However the other members of the family are not too happy with the idea.

Chip is worried when his younger brother Ernie becomes a close friend of a pretty sixth grader, because the girl is now interested in collecting postage stamps, and Chip is sure she has her eye on Ernie's precious Liberian triangle.

Chip demands a jury trial after he borrows four cents from a pile of brother Ernie's pennies and Ernie accuses him of taking a valuable penny from his coin collection. Finally Chip accepts Ernie's challenge to stand trial in a court composed of their friends.

Ernie packs a suitcase, ready to leave home, after he fails to win a cup for the family trophy shelf. He eagerly goes into training, planning to win a school track award, convinced that he won't really be a member of the family until he too can provide a trophy.

A boy who looks just like Robbie almost ruins his reputation by driving around on-campus and inviting strange girls to kiss him, before the deception is uncovered. Finally, both boys and their parents are brought to the dean's office.

Uncle Charley takes away Robbie's driving privileges after the campus beauty queen gets a $16 traffic ticket while driving his car. Robbie then faces the horror and humiliation of exisiting without a car, but soon to his amazement his girlfriend is enjoying walking home from school with him.

The Douglas family returns from a trip to Britain and as the family watches home movies of their vacation, the amateurish footage reveals the reason for Steve's current moodiness: He is still carrying a torch for a lovely widow.

The usually all-male Douglas household becomes a refuge for an attractive girl dancer who has been evicted from her apartment, when Steve attends an office stag dinner. He takes her home where he lends her some of Robbie's clothes.

Steve Douglas takes his family to his birthplace of Bedford Springs. He tries to locate his 1940 fiancee Ellen, married and still living in town, but he is disenchanted by the changes in her. Still pretty, she lives with her obnoxious husband and ill-mannered children.

Steve Douglas receives a perfumed letter from an old girlfriend announcing she will stop by and see him. She terrifies Steve by acting as though she plans to accept a proposal of marriage he hasn't made. Steve does his best to convince her that his old college chum is the man for her.

Three fathers face their sons in a quiz game at a school entertainment night, and when the boys easily beat the dads so much interest is aroused in town that a re-match is scheduled on the local television station.

Because Robbie's friend wants him to understand Italians better, he invites Robbie to his home. Robbie runs afoul of an old custom when he takes a girl walking in the park and learns that he is expected to marry her.

Steve Douglas gets a parking ticket from Robbie's girlfriend, a pretty meter maid, and another citation for not having his driver's license renewed -- and then flunks his driving test. Soon Robbie realizes that he's given his father last year's manual to study and that some laws have been changed.

Robbie films a 'way out' movie for his Cinema class with the aid of a non-talented, 'way out' co-ed who earnestly tries to make an 'honest' motion picture. They begin a long week of filming uncinematic gems spotlighting the Douglases dull, drab meaningless family routine.

Ernie feels left out when the Douglas family orchestra begins to practise. Uncle Charley tries to teach Ernie the violin but runs into a major obstacle -- the boy's lack of obvious talent.

When Robbie's girlfriend's father calls from out of town and asks him to deliver a birthday cake to her, he thinks there might be a fortune in performing this birthday service and immediately goes into the cake business.

Robbie is immediately infatuated when he hires a pretty chemistry instructor as a tutor, and their friendship seems to be blossoming. But when he finds out that his father has been dating her, the shock affects his ability to concentrate on his studies.

When Ernie sends for a picture of Chip's favourite movie star, planning to give it to him as a birthday gift, Chip gets an actual date with the movie starlet for a publicity stunt and is astounded by all the resulting hoopla.

Steve Douglas meets a celebrated popular vocalist of 20 years ago whose career seems over. Although her famous voice is still there, the public demands music in the current style. Steve helps her update her style when he arranges for her to sing with Robbie's combo, the Greefs.

Ernie sneezes as he brushes past the family dog, Tramp, and when a doctor verifies the boy's allergy to dog hair and says the dog must go, Ernie packs his bags as he feels Tramp has seniority over him in the family.

Chip's romance with a classmate flourishes when he rents a horse and buggy so as to impress the girl's strict, old fashioned grandmother. She is impressed, but still insists that the kids stay at home to have a taffy-pulling marathon.

Ernie's excited reports of seeing a flying saucer are received with skepticism, but the next day he not only sees the weird vehicle again, but he snaps some pictures and is later told by the Air Force to keep quiet about it.

Robbie is delighted when college classmate Peggy moves in next door, and the pair immediately go to work on a joint assignment for their Shakespeare class. He plays Romeo to her Juliet when a feud between the two families seems imminent.

Steve Douglas passes up his company's offer of a weekend in Rio because Saturday is the start of trout season. The boys do their best to get Steve to make Ernie his fishing buddy so Robbie and Chip can get out of the annual trip.

Television viewing at the Douglas household has dropped to zero because Uncle Charley, annoyed with the boys' quarreling about choice of channels, has withdrawn all TV privileges for a week. Robbie, a member of a new program committee, eagerly joins his co-ed girlfriend in her plan to bring true drama to the people. However, after viewing the show, the family isn't sure their attempt at 'realism' is really real.

Ernie's friends all boast of their dads' college athletic trophies, which forces Steve into a grueling two mile cross-country race with the other fathers. Two of the men, once athletes are eager for the contest, but Steve thinks it is silly.

Uncle Charley puts down a deposit on a vacation lot at beautiful Whispering Pines, only to learn he's been hoodwinked in a high pressure real-estate operation. The family discover that it is located at the bottom of a steep canyon. It is next to a tumbledown shack, occupied by a slovenly family who prove themselves completely undesirable as prospective neighbours.

Robbie Douglas tries to impress his girlfriend by competing with a handsome bullfighter against a killer bull, but has to flee for his life when the bull charges him.

Robbie is crushed when he learns that Denise DuBois, a French exchange student that Robbie had hoped to marry, has accepted his friend Tom's proposal of marriage the night before.

Chip Douglas's junior high school is having an Olden Days dance and the boys are to bring their mothers, and the girls their fathers. Chip finds trouble going steady with two girls at the same time and arranges for Steve to escort his classmate's widowed mother.

To help out his Dad, Steve, Chip pretends to like the aggressive as she is pretty, daughter of a new executive woman that his dad is dating. Chip has the romantic notion that his close relationship with the daughter might help the social plans of his father.

Uncle Charley's romantic tales of adventure captivates Ernie's teacher. The pretty, middle-aged lady is fascinated by the old boy's partially-true tales of his exciting life on the high seas. Soon the ex-seacook is aghast to learn she has given up her teaching job and he is further torn when she explains her savings will buy them both a one-way ticket to Pango-Pango and asks him to marry her before they leave.

Ernie Douglas's new school friend is little Laszlo, whose gypsy family is camped outside of town. Soon the gypsies are camped on the front lawn of the Douglas home. To Steve's amazement and Uncle Charley's disgust they stage several hours of singing and dancing.

Other fathers help their sons in a school science fair, but Steve tells Ernie he's on his own. Soon his project turns to disaster when his very crudely built electric clock absolutely refuses to run. After vainly pleading that most of his classmates are getting parental help, on the day of the fair, Ernie must be forced to go to school.

The older members of the Douglas family find their social lives complicated when little Ernie decides to accompany them on all of their dates. Uncle Charley decides he must be the one to put his foot down and set the boy straight.

A genial bum Ernie brings home for dinner outrages Uncle Charley by eating everything in sight and then decides to stay the night even though he wasn't invited. Steve feels that they should let Ernie work things out for himself.

Robbie leaves school after contemplating a very important offer from a former school drop out who now heads his own Real Estate company. When giving some new home buyers a tour of one of the company's display homes, he discovers that the houses are not what they seem.

Uncle Charley's old seafaring buddy arrives with a wonderful proposition: He wants Charley to join him as first mate for a six month fishing cruise in the Carribean. The family then conspires to demonstrate to Charley that he is not needed, but they really don't want him to leave.

On a visit to Hawaii, Robbie falls in love, Ernie almost gets arrested and Uncle Charley is pursued by an old girl friend from 1945, who weighs 200 pounds now. Charley thus finds it necessary to stay in hiding until the plane leaves for home.