Like every Christmas, Eric compromises the kids' fun by imposing 'voluntary good deeds' and cheating the draw of the family presents distribution. Matt is even pressed into a mall Santa job, with a jealously rebellious dwarf-size elf. Jordan can't avoid a family event and his gift for Lucy stirs more absurd speculations. Mary felt lucky the soup-kitchen she's pressed into happens to recruit hunky Carlos, a homeless Puerto Rican New Yorker who travels since his home break-up two years ago, but Eric arranges a speedy reconciliation. Simon takes it on himself to save Ruthie from losing faith in Santa. Eric and Annie's second-hand or home-made gifts rule bites them in the asses, yet 'Santa' rescues them.

The Camdens have a bad vacation;Simon is depressed over accidentally killing a classmate; Lucy and Kevin discuss starting a family; Mary deals with something she's not ready to share; Peter spends more time with the Camdens.

Mary reveals that she married Carlos. Simon does not want to return to high school and Eric tries to find a solution for him. Roxanne and Chandler end their relationship.

Weeks after the September 11 attacks, Eric challenges his parishioners to do something good for someone else and use their own special talents to help people in need; he must find his own way of giving to others.

Lucy thinks Kevin's partner is keeping secrets from him, such as she is trying to become a detective. Matt is having problems in his marriage. Martin learns that everyone thinks he is having sex with Cecilia.

Cecilia breaks up with Martin because she wants to be with Simon. Matt continues to run into a former girlfriend and is concerned about his marriage falling apart. Ruthie's foreign exchange student visits and is now living with the Camdens.

As the presidential election approaches, Martin is too vocal in his opinions and Ruthie realizes she has none, Annie and Eric might be on different sides of the political ticket, and Lucy and Kevin have never registered to vote.

With Thanksgiving approaching, everyone seems to be planning something different. Lucy wants to host the big meal, Simon wants to stay at college, Mary is staying in Puerto Rico, and the others also have different plans. Annie is upset.

Cecilia's dad George Smith tells Eric that he and his wife Gwen are looking for a foster-son, about 10 years old, to fill the now empty-feeling home, with the hope of adopting. The enthusiastic reverend immediately thinks of orphanage boy Danny Davies, who proves charming and eager. Danny expects to that his sisters will be adopted too. It's only fair that Eric helps put that straight, which proves even more complicated then it sounds. Carlos tells Matt he's leaving New York for his dad's firm in Puerto Rico because 'mother' Mary makes no marital effort at all, having cheerfully signed over custody of baby Charlie. The twins are sad that Martin, and in time all their siblings seem to leave, even Lucy now. Kevin presses her to finally choose a house, then concludes the mother is the one who pushes fledglings out of the nest. Simon's girlfriend Rose wants to dump him unless he gives a good reason why they still don't have sex. Vincent pushes Martin to help him break up with Ruthie, in case he meets a girl while on vacation with his grandparents on Hawaii.

Eric tries to avoid telling his parents about Mary's divorce. Simon's fiancee wants him to move up the wedding date. Lucy learns the difficulties of being an associate pastor.

After a scary arrest which could have gone fatally wrong, Kevin decides to leave the police before someone gets hurts as he can no longer concentrate on anything but his young family. Ruthie brings over Meredith and her presumed boyfriend Jack, who proves a natural with babies and a nice senior - too old, so - and is on to her plan; Meredith actually is more interested in the other good boy, Tyler, who agrees with a demure kiss to date. The colonel arrives, winking to Martin about his Iraq veteran dad's gardening job and to Eric's surprise already knows about Charlie - even got and believes Mary's version that Carlos cheated on her, but Carlos explains she just 'caught' him dining with Cecily, the nanny he had to hire because Mary was never home. Simon first scolds, then consoles his ex Sandy for having seduced and made a baby with Martin. Eric spoils the twins fun playing cowboys with granddad because he bans all gun toys and is told to bother about real problems. Lou Dalton tells Eric most parishioners want Lucy fired as his associate pastor.

Annie and Eric are delighted with Matt and Sarah's surprise visit in time for Simon's wedding--and not just because they announce they're expecting. Simon is relieved that he and Rose aren't expecting, therefore marrying purely for love; but the next minute he gets cold feet, at which Lucy eagerly pokes. More visitors, like Matt's one-time bride-to-be Heather, stir further reminiscing and speculations; Rose's ex Umberto even asks Eric's permission to sabotage the wedding. The big day is full of surprises, including from Matt and Carlos.