Playing in the park with cute little Billie, handsome student Wilson West meets Mary and both get butterflies. Wilson's impeccable charm, doctor-pa and record pass even Eric's paranoid muster, but on Sunday he divulges that Billie is not kid brother but his own son. At the airport to pick up maternal grandpa Charles Jackson, Matt is smitten at first sight on a girl he later traces and learns is deaf Heather Cain. They date, but she flees the party after some youths make fun of her sign-language. Eric and the kids welcome grandpa's new 'significant friend' Ginger, but Annie irrationally rages against any suggestion a successor for her ma could be less then diabolic.

Wilson West tells Eric that Billy is his son, unplanned but not unwanted, whose teenage mother died giving birth to the angel, which his parents help him raise. Dating privileges are maintained 'for observation'. Michael Towner bravely owes up being the one who accidentally hit Mary when she dashed after Annie, who realizes she's the guilty one but only tells off Matt's overprotective vindictiveness. Sign language in a deaf-run restaurant helps Matt patch up with Heather. Jimmy Moon dumps Lucy on account of her endless hair wining. Charles Jackson nearly lost hope Annie would turn round and Ginger imposed 'a break', but both women come to their senses after some surprising 'counseling' and fibs. Mary is released home, but recovery up to basketball level is far from certain.

Matt worries now he's about to leave home, as self-absorbed, phone-glued Mary hasn't even got a clue what's happening with their younger siblings, nor is any use for either. Simon is heart-broken when Happy's original family head Jack Martin turns up and returns with a lawyer to claim the dog back. Eric considers his parents's surprise visit awkward and pointless as Matt won't be around to hold his valedictorian speech. The colonel however takes charge of an operation dog rescue inspired by Jimmy and Rod. Those two also undo Lucy's idiotic dumping of Kenny for being 'too perfect to be interested in her' and hold a remarkable church sermon. Matt changes his plans after a call from the colonel, learning about it and Annie's confession that Mary's pregnancy diagnosis got mixed up with her real one.

Preparations for grandpa Charles Jackson's wedding, to be celebrated by Eric on Veterans Day, go as bad as Annie predicted and hoped, albeit for different reasons and everyone ends up reconciled with it and each-other. Matt grudgingly takes flippant Mary on a road-trip, only to find her ignorance as bothersome as a flat. Simon deals with Howie's resurgence. Meanwhile World war II veteran sergeant Millard proves less willing to accept help he qualifies for the extending some to the wedding reception. Lucy is mortally embarrassed when Jordan corrects being presented as her boyfriend, but he only wants to clear the air concerning their past-only with Jimmy Moon first.

Robbie fears Eric will never give him a chance when told, now his and Mary's community service goes so well they can meet, but only at home. Super hot Brad Landers finally asks Lucy on a date, but she stresses over a time-clashing girls project. Simon looked forward to the 'guys night like it used to be' Matt promised him, but his sleepover proves a testing marathon of witnessing stressing over Shana's New York dorm. Annie's step-ma arrives reporting Charles has Alzheimer, he claims it's the other way around. Schoolmate Ben's family inspires Ruthie to fear an apocalyptic millennium bug.

Simon's big day, the start of his driving lessons, finally arrived, but Eric just forgot about it. Grandpa Jackson seduces the knave into driving him around without a license, which leads through more bad grandfatherly advice to a televised police car chase. Jealous of Joy, Matt behaves childishly toward Robbie whose gentleman's attitude ultimately gives in. Lucy hoped Jeremy called to make up, but he just wants his engagement ring back. The local fire chief isn't fooled by Mary's eagerness to transfer.

Preparations for Matt and Sarah's wedding are being made and things aren't going the way Eric or Annie planned. Matt decides he will convert to Judaism after a discussion with Sarah's dad who convinces Matt that he can convert on the wedding day much to Eric's dismay. Annie panics when Sarah's mother tells her to expect 100 kosher guests to her backyard pot luck dinner. Ruthie and Simon begin to resent Robbie being in the house. Ruthie wants her bedroom back forcing Robbie out now that Matt will be moving out and Simon gets upset that Matt chooses Robbie to be his best man and Sam and David call for Robbie instead of him. Lucy gets upset that Kevin won't come to Glen Oak for Matt's wedding and Ben decides to propose to Mary after Mary starts giving him the cold shoulder. Eric and Sarah's dad the Rabbi go head to head and it seems Matt and Sarah's wedding won't go ahead after all.

The Camden family gather together for Matt and Sarah's wedding. Eric and the Rabbi make amends while Ben and Kevin decide to go to Glen Oak to pursue Mary and Lucy. Ruthie and Simon sort out their issues with Robbie.

Love and marriage seems to be on everyone's mind as Annie's sister is planning her wedding, a mentally challenged couple wants to get married after just one date, and a couple has their premarital counseling with Chandler.