Jack and Carly are newlyweds anxious to prove to themselves and to the world that they can make their marriage work. She's running a fledgling catering business and has been married twice before--to Dante, a blue-collar would-be musician with whom she had a son, high-school freshman Will; and also to Sheldon, a rich businessman who is the father of her younger daughter, Sarah, 11. Jack is a schoolteacher who has an about-to-turn 16 year-old-daughter, Nicole, and is divorced from her mother, TV actress Stephanie.

The ""blended"" family has been living in their new Manahattan apartment two weeks, and while Jack and Carly are wildly in love, the kids are getting testy. Nicole and Sarah are both chafing about having to share a room, and Will is infatuated with his beautiful stepsister, as evidenced by him ""accidentally"" walking in on her in the bathroom. Now Sheldon enters the picture saying he thinks it would be best if Sarah came to live with him. Carly asks for two weeks to see how things

Carly is planning a 16th birthday party for Nicole, the first birthday for the new family. At school, Jack's ex-wife Stephanie, star of the action-adventure show ""Thena,"" shows up and creates a scene. She's in town for a while and invites herself to Nicole's party. Carly is concerned about her first meeting with Stephanie and is afraid she might be sniffing around her ex-husband again. Whe Stephanie and Carly are alone together for the fisrt time Steph breaks down crying about her split with her current companion Stan and her messed-up life, getting a little more intimate than Carly would like. Stephanie announces to everyone that she will finding a place in New York so she can be close to her daughter. At the birthday party Stan shows up, saying he wants to get back together with Stephanie and marry her. Jack and Carly counsel the couple and let them spend time alone in their bedroom to decide what to do. The sounds coming from the bedroom indicate the reconcilation was successful, bu

Carly meets a New York Times reporter who is doing a story about women balancing career and family, and she is interested in profiling her. But when Carly invites her over for dinner, the reporter gets an eyeful of the more chaotic side of extended family life, plus Jack and Carly get into an argument about keeping secrets from each other.

While looking at some old photos, Carly is inspired to set up a shoot for a family Christmas picture, even though it's only October. Jack's ""traditional"" Santa Claus sweater is at his old dry cleaner Tony's place, which Carly wants him to give up now that he lives so far away. When Jack goes to retrieve the sweater and give Tony the news that he won't be using him anymore, the dry cleaner petulantly refuses to hand over the sweater without a ticket. Sarah, under the influence of Sheldon's wife Marianne, thinks she needs a nose job, which causes a big argument between the adults. Then Will gets a black eye at school defending the honor of his stepsister Nicole. Topping off a day of disasters, Carly's employee Newton delivers unseasonable decorations to the apartment.

The pressures of work are keeping Carly and Jack apart more and more. He surprises her with a picnic at her office but she can't even take fifteen minutes to enjoy it. Jack decides not to go schmooze at the faculty Halloween party and Carly lets Grace handle the big toy manufacturer's party so the couple can spend the evening together. But Carly can't stay away from her big event, so Jack heads for the faculty party. He doesn't stay there long and ends up at Carly's party. While there, he pretends he's not Carly's husband and talks up her virtues to several prospective clients. After the party, these same clients see Jack and Carly making out, and thinking she's cheating on her husband, they cancel plans to give her their business.

It's Christmastime, and Carly is depressed because all the kids are leaving to spend the holidays with their other parents. Jack just wants to get everyone ready and out of the apartment building. His reason: on his way in his car splattered their hapless neighbor Mr. Sandzimeier with water and caused him to fall down while carrying his groceries. Of course Jack can't escape a confrontation with him. Later, with the kids gone, Carly wants to do something meaningful for Christmas, like take Sandzimeier for a carriage ride. When they knock on his apartment door, though, they find that they've woken him up from a much-needed sleep now that he is getting ill from Jack's drenching. Carly and Jack return from their carriage ride to find a large puppy in the elevator. Carly insists they take it in for the night, against Jack's better judgment. They leave the dog in the living room for the night, where it proceeds to tear up the Christmas tree, decorations, presents and an odd pillow or two. W

Stephanie shows up, unannounced as usual, and asks for the return of a painting that Jack has from their married days. While he and Carly are searching for it in the storeroom, they find something Jack had forgotten about--a receipt for a 1979 sperm bank deposit, which can't be destroyed without Stephanie's permission. They bring the painting by her apartment and tell her about the deposit, but Steph says she will have to think about it first before signing a consent form. Later, as a guest on ""Adam Smith's Money World,"" Stephanie drops a bombshell, saying she'll be having her ex-husband's baby. It takes some convincing from Jack and Carly, but after reminding Steph how miserable she was during her previous pregnancy, she relents. But now Steph's housekeeper Polly decides she wants to become a mother. Also, Nicole tests the patience and courage of Jack and Grace as she learns to drive.

Jack and Carly have planned a romantic vacation in Mexico for just the two of them. The ex-spouses will be looking after the kids while they're gone, but Carly has second thoughts about leaving them out of their plans. As they rush to get ready for their departure, the couple, the children and the exes all are involved in a series of mishaps which makes it seem like fate is conspiring against them.