The six-year on-again, off-again relationship between Robert (Brad Garrett) and Amy (Monica Horan) is definitely on again in this pivotal episode. So much so, in fact, that ""Robert wants to propose to Amy,"" says executive producer Philip Rosenthal. But there's one formality the hopeful groom-to-be must take care of first: asking Amy's devout churchgoing folks (Fred Willard, Georgia Engel) for their daughter's hand in marriage. To that end, ""Robert convinces Ray to accompany him to meet her parents in [Pennsylvania],"" says Rosenthal. How they---and possibly Amy---respond determines whether wedding bells will be ringing anytime soon. Peter: Chris Elliott. Frank: Peter Boyle.

Amy's mom and dad finally meet the Barone Family. Amy's folks show up unexpectedly at their daughter's house on a Sunday morning. They want to talk Amy out of marrying Robert and take her home to Pennsylvania with them. First, they are stunned to see Robert there. Then Frank and Marie arrive. It doesn't take long for the two sets of parents to disliking each other.

Yet another bump appears on the rocky road to Robert and Amy's wedding, which was nearly blocked by her disapproving parents. When the bride-to-be (Monica Horan) puts her betrothed (Brad Garrett) in charge of writing the wedding invitation, he seeks input from Ray and Frank. While they can't believe Robert let himself get roped into such a chore, they nevertheless come up with a plan: If Robert makes a mess of the job, it will convince Amy that she should take care of all the wedding plans herself. So the groom drafts an appalling mock invite---complete with the wrong date and names---and waits for Amy's reply...which is worse than he ever expected.

Ray hosts a lame bachelor party for Robert and is shamed by Debra, Marie and Amy into throwing him another one at the lodge, which is attended by Amy's father and brother.

Robert and Amy exchange vows in a classic Barone family wedding ceremony.

Robert and Amy exchange vows in a classic Barone family wedding ceremony.

After Amy invites her brother Peter to stay for dinner, he makes himself at home on the couch and never leaves. Meanwhile, Robert overhears a conversation that hits close to home when the Barones and Amy talk about the difficulties of having a 40-year-old man living under the same roof with his mother and father.

Robert and Amy convince their families to spend Thanksgiving together. When the Barones arrive at the Pennsylvania home of Amy's parents, they find that their differing family traditions encourage lots of lively conversation. If only the MacDougals owned a television set! Things start to come together when the families separate into Pilgrims and Indians for the annual MacDougal Thanksgiving Family Pageant. All is well until a bird flies into the house and Pat McDougal decides to ""put it out of it's misery.""

After Robert takes a second job selling home security systems, he reveals he's been asked to join the security firm full-time and is mulling over retiring from the police force early. While Marie is overjoyed, Amy questions if this is really what Robert wants or if he's only retiring early to make his mother happy. The disagreement about his future leads to a tense birthday party for Robert.

Amy's parents put Robert on the defensive when they point out his strange habit of touching food to his chin before he eats it. When Amy confides in Debra, who tells her that Robert's strange behavior could be psychological, she devises a plan to break him of his chin habit for good.

When the MacDougals are invited to spend Easter with the Barones, the families attempt to bond over a 500-piece puzzle. While members of the Barone and MacDougal families get frustrated with the complicated puzzle, Ray and Pat continue working on it until the wee hours of the night while sharing private stories about themselves and their families. But when Debra, Marie, Robert and Peter find out about Ray and Pat's newfound friendship, jealousy ensues.

Debra invites her divorced parents, Warren and Lois, to the family Thanksgiving. When Ray walks in on the two making love, he and Debra assume that they are getting back together. Later on, Warren and Lois inform Debra otherwise and an unprecedented turn of events shocks everyone.

Amy's parents ask Ray to give their son, Peter, some tips on dating. Later, Debra throws a cocktail party and invites some single women to meet Peter, but Ray isn't thrilled with the guest list.

Robert discovers Pat smoking and she pleads for him not to tell. Later, when Amy smells smoke on Robert, she thinks Robert smokes. Frank, Marie, Peter, Hank and Amy all think Robert smokes. Robert gets yelled at, and Pat doesn't tell the truth or back him up. The next day, Robert tells Raymond and Debra about Pat, and the family comes over. There is a bitter argument and then Ray and/or Debra yells out that Pat smokes. She confesses and tells the truth. There is another argument and Peter confesses something, then Hank, then Ray, then Debra. It ends with Frank and Marie telling them that they are weird and that they shouldn't do the stuff they are doing.