When the Camden family learns that their friend's church was burned down by a racist group, they invite the Hamiltons to stay at their home. Meanwhile, Simon has his own problems when defending his friend Nigel after a racist comment is made to him on the playground. Matt, Mary, and Lucy have a hard time while trying to develop a good relationship with the older Hamilton children, Keesha and John. Eric and Annie do their best to help Morgan and his wife, Patricia, get through their marital problems while Ruthie and Lynn are having fun as five-year-olds.

Mary tries to impress her basketball team by stealing a glass from their teen hangout "The Varsity", which is a school ritual. A misunderstanding occurs which winds up with Matt being arrested for stealing the glass. Lucy cheats on a school paper by taking one of Mary's old papers and putting her name on it. Ruthie asks Simon about help when she overhears her father talking about how it bothers him when people in America don't know the National Anthem.

While both couples, Annie and Eric, Patricia and Morgan Hamilton, spend a romantic Valentine's Day camping, Matt is left in charge of the rest of the family and allows chaos to rein in the Camden household. His preoccupation with his date and Mary's party allows the dog, Happy. to slip out of the house in search of her puppies. When a car hits Happy, the family holds a vigil, aided by a caring veterinarian. Simon blames Matt for the accident. Lucy is enjoying her first Valentine's Day with her boyfriend Jimmy Moon.

The reverends get their spouses to handle the annual two-families-day so they can go play pool. In fact Morgan arranges finally to meet his wife's ex Kevin, who turns out to be a happily remarried Vietnam vet in a wheelchair. As Eric expected, all kids want to do things without any parents, so only the youngest are dragged to a cartoon movie by the moms. Simon is excited about his first 'making out' party, yet terrified when it's time to step into the closet and probably kiss. Scott is 14 but looks 18 and tutors Lucy maths just so he can successfully treat Mary to a date, only to be kept on a string. Matt is surprised that the jazz club John dragged him to is his mate's singer career bid launchpad, unamused to be asked as support against Morgan. Lucy has her own date Rick, but chose the same cinema as Annie.

With the twins birth impending, Eric makes the kids' life miserable by fussing and over-planning, yet blames Matt for preparing the youngsters for what's ahead. Annie adds to the mess by inviting over the Hamiltons, just so Patricia can help her ward off the parish busybodies, who forced a baby-shower on her so they can snoop around the church-owned home. Ruthie acts as if a victim when classmate Bobby points out her underwear visible by failing to wear school-regulation shorts. Her elder siblings are pushed to confront Boby's family, but his brothers aren't only taller, like their dog, they also bond with Matt and Mary and end up turning on the brats together.

Mary and Lucy selfishly make Matt feel 'guilty' he hasn't moved out yet, although Annie still hopes to keep him home in a garage apartment. They even get Hank to find him a menial morning job in the hospital cafeteria. But Simon feels desert when Matt takes an apartment with John Hamilton. Eric and Annie worry about the Colonel's attitude to Julie's marriage, but the grandparents have gone soft after an around-the-world trip, as George's crazy hairstyle illustrates. But the stress gives already-overworked Eric a mild heart attack.

Eric is released from hospital but drives everyone crazy with his enjoyment of every imaginable 'small blessing'. Simon man feels his stepping in as in the house is undermined when Matt joins the ridicule of him shaving and is tricked by Ruthie. Simon makes a commiserating friend, Jim. Matt still tries to get used to his early morning job and Shana is jealous about him spending most time there and with his roommate.

Simon lets school friends convince him he should kindly handle a crazy girl who signed his first name all over a notebook but keeps sending mixed or rather contradictory signals. When his roommate gets a cool job, Matt is fed up with his menial one in the cafeteria. Kid patient Adam's attempts to help seem to backfire. The Camdens really need a new car, but when Eric is seen test-driving a sports-car and Lou sees furnishings arrive for the extra bathroom Annie helps the girls install for their 'attick suite', the board votes against his annually scheduled raise.

Simon is in absurd trouble just because his mother and the principal make a huge drama of a finger-gesture among schoolboys. Matt tries to explain, but Simon feels he's robbed of another part of his childish innocence. Matt wrestles with domestic problems among his roommates and considers moving back home on account of Eric's cardiac condition. Basketball coach Jason Cleary decides the girls' continuing grades slip warrants drastic action: a team lockout, which makes the local TV news and because of official secrecy starts a rumors circuit.

The whole community is shocked to see Mary and half her Wildcats team meanly vandalized the school's gym. Simon and Ruthie feel guilty for not telling they overheard her planning 'something extreme', so they seek redemption in Catholic confession, a synagogue and a Buddhist temple. Matt feels guilty enough to move back in and resume his task as big brother, only to find that o longer requires his presence and return to his house-mates. Eric calls a marker on lawyer Bill Mays, he gets her in to a trial-avoiding parole office 'last chance' program.

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.

Robbie and Mary get to go to the movies on a double-date with his brother Rick and Lucy, but that unwilling couple ends up cheating on their partners, while Robbie has another secret. Simon and Nigel buy cigarettes illegally for a school project, yet Eric waits even while they ponder about smoking 'just one'. Matt is a wreck after Shana fails to call once, worse when she does too cheerfully, but his very despair attracts both girl neighbors his house-mate invited.

The parents insist on spoiling the kids' Valentine's day by celebrating the baby twins' birthday and demanding presents. Robbie gets permission afterward to drive Mary to the coffeehouse where his parents met. Matt puts off telling Shana his ex Heather transferred to his college, but Mary spills the beans. Simon's first passionate kiss caused a love-bite, which Deena meanly insists to return, causing disastrous discovery. Matt sees Robbie with 'his brother's date', sees through it but isn't believed that's cheating, until the romantic trip's hidden agenda is revealed.

Eric's reading of an anonymous letter, the juvenile author of which he later shamelessly tracks down, asking for prayer, the power of which he praises blindly, starts an epidemic of selfish praying. Matt and his roommate want female companionship, but Raven of mixed exotic extraction only complicates their lives. Simon hopes to mend with Deena's family, Mary to undo the break-up with Robbie. Lucy secretly wants Andrew but only if he loves her, and gets to meet his namesake in church.

Simon and Lucy talk about their parents lives. When Eric and Annie overhear them, they are hurt by the discussion. Mary has dreams of being a basketball star and a talent scout contacts her.

After Eric is approached by a mystery girl he can't identify, who won't tell her problem, the Camden parental paranoia extends to preventive preying, so the kids assume one of them must be in trouble. After Lucy launches the theory her siblings may invent colorful friends to 'test' their own fib stories, pointless palavers abound. Simon proves his funny classmate Luke is real, Mary is keeping an outsider's secret. Hank blames Matt for his marital crisis just for accidentally giving jealous aunt Julie the impression Hank shares a secret with Matt, who thus gets a wealthy lodger on top of his roommate till further notice.

Eric is very proud when newspaper reporter Sam Robbins offers to cover his reverend's family. Despite warnings from the kids, the parents force all to collaborate, and but they end up betraying all the dirty laundry they warned their siblings not to betray. Matt meanwhile thinks that new orderly Elisabeth admires him, but in fact she only spreads malicious lies.

Each one of the Camden kids has a relationship problem; Mary decides to skip college and get back together with Robbie; Simon is dumped; Matt is torn.

Simon learns the truth from Deena about why she broke up with him; Ruthie and Lucy try to reconcile with their exes; Matt gets back together with Heater.

Eric rightly predicts that the kids will only be more trouble in the new school year, yet Annie enrolls in a college course. Simon's only friend is Jim, who drags him along into minor vandalism as a gang initiation. Matt grudgingly admits that Heather left him at the altar; Lucy learns that Andrew Nayloss made an irreversible mistake in France (his father sent him to Europe to keep him far away from Lucy over the summer). Mary starts a minimum-wage job and gets a credit card and still doesn't see college in her future.

Matt blames his first-ever bad grade, for the crucial course organic chemistry, on everyone and collect excuses to delay studying rather then seek help. Simon is desperately lonely again after Jim's ma absurdly blamed him, but finds unhoped popularity when helping Lucy campaign for ball queen. Eric worries more about a surprise visit then the obvious reason, another attempt to make Mary see sense now she's behind with her car insurance payments.

High school freshman Simon desperately looks for a new image, but clothes nor hairstyle do the trick, so he ends up with an earring. Matt is puzzled when a girl he approaches in the library calls her brother's help against him as 'stalker' after hearing he once dated Heather. Mary breaks every rule and promise when babysitting for Hank by taking in Frances's baby so her 'friend' can spy on Johnny, but the Camden parents' pool night just there makes the real, for all concerned unpleasant difference when Eric blindly assumes Johnny to be an abusive adulterer, while Frankie rather trapped him.

Irresponsible 'adult' Mary fails to realize how deep she's sinking, but both parents and siblings piece together from various sources she's about to hit rock-bottom but have no idea how to help? Eric can barely keep Annie from intervening directly before they know everything. The kids decide to 'borrow' enough from the twins' full piggybanks to cover her debts, but creditors seeing cash convince her to 'refinance, which would mean even more interest.

Simon lets his mate Luke set them up with the Murphy twins, who fall for his cool 'bad boy' image by association with Mary, but the vixens make the knaves join them in shoplifting and other mischief. Matt falls in love at first sight with a girl in a wedding dress, actually model Julie. Only Mike teaches Lucy how to handle gossip. Annie seeks comfort with a friend, positive thinking guru Robin, who turns out rather negative.

Robbie and Cheryl ask Eric to marry them because of her pregnancy. He smells a rat and learns just in time that she intended to trick Robbie, who is grateful to escape a loveless marriage and offers to stay away from Mary. Lonely Simon has joined punk Norton's schoolmates gang. Lucy, who is lightly butt-slapped, and the Camden parents, make huge scenes over inappropriate remarks from some of the knaves, treating Simon as if he 'hates women'. Matt tries to help both sides understand, but fails, yet a real incident shows Simon's truly good nature. Matt can go for Priscilla after hearing from Heather she's dating another already.

Robbie's ma lost her house and moved away without him and moving in with Cheryl also fell through, so Eric finds him studying outside, yet keeping up top marks. He promises to find a shelter and takes him home meanwhile. Despite embarrassing episodes, all the fault of Camden girls, Robbie proves himself a model house-guest. So Matt finds the couch occupied when chased from his dorm by John, who is completely besotted with Priscilla Carter. Simon keeps is foxy new date Sasha a secret until she arrives in a BMW. Lucy is passively jealous when Mike Pierce announces he got early college acceptance, then goes over to make up and thus discovers his ma's disabling mental condition.

A month later, perfect house guest Robbie is getting popular with most Camdens, except Annie who childishly splits hairs about his domestic input, meant to help her but making her feel redundant, while Ginger takes care of grandpa. Matt is unwilling to stand by John when he meets the Carter parents and seeks refuge with Heather, whose boyfriend Thomas gets them off their backs by suggesting they're a sheets magnate family. Mary starts a round of panicking with a false rumor that Robbie is dating Lucy. Simon is flattered when Robbie asks his financial advice and starts copying him, even Matt follows suits walking around shirtless. Robbie finds a surprising job and the perfect thank you gift.

Eric threatens Robbie with eviction because he thinks he's keeping secrets about Mary. The house is abuzz with secrets and preparations for an elaborate surprise party for Eric's birthday. Johnny drops Mercy on the Camdens' doorstep after Frankie abandons them. Mike trusts Lucy enough to look after his mother for a day, during which the woman surprises her, both by speaking and by what she says.

Robbie is not amused by week-long roommate Matt's jealous whining, but still helps him make up with John, who lacked the courage to tell Priscilla her 'Japanese' room remodeling disgusts both guys. Mike decides after a kiss without chemistry to trade in Lucy for Elaina Casey, while matching Lucy with Mike's friend Jeremy. Simon and Robbie prevent suddenly jealous Lucy's reactions spoiling the whole partner-switch, which thus ends well.

Everyone but Lucy is stuck home celebrating the twins' birthday on Valentine's Day; Lucy and Jeremy keep running into Lucy's ex-boyfriend.

Robbie wonders why Matt is suddenly so friendly, ignoring it's because Matt dates his ex Cheryl, who wants him to tell Robbie but doesn't push that, while Robbie spontaneously tells he studies a course with Heather, who needs his help. Simon feels a social outcast when nicknamed 'virgin Camden' because his mother assured Sasha's blabbermouth ma he's sexually inactive, but actually schoolgirls line up to date him. Viciously jealous, Annie meanly forces Eric to give up counseling Serena, yet denies that's her doing and sticks to her guns after Ruthie commends her as bitchy selfishness-model.

Robbie panics when Mary announces she's returning for the summer months, so he tells her to follow parental instructions not to date her all that time. Mike inspires Lucy how to stay with Jeremy now he's accepted to Juliard: marriage, so they get engaged. Matt is dumped by Cheryl for not telling the family about them, but that gives him the courage and more reward then he bargained for. Wilson was dumped but traveled all the way home, just when Mary's claim of sexual intimacy with Jeremy make Robbie deck Lucy's equally startled fiancé. Simon and Tim discover Deena dated each of them behind the other's back. Serena abuses her lonely birthday to make a move on therapist Eric, while hardware shopkeeper James Carver courts long-oblivious Annie.

Robbie gathers the courage to tell Mary openly, now her lies are exposed, their relationship is over, staying with the family his priority. Simon nurses his broken heart on account of Deenah, refusing to become 'just friends' again. Wilson bonds, while bunking, with Matt and Robby, and demands for Mary to return and go steady in New York, or break up completely. Jeremy forgives Lucy for doubting her fiancé's fidelity. Ultimately Eric helps her transfer to his New York alma mater, near Juliard. The Camden parents finally realize Serena and James are seducing them, ward off each suitor and match the lonely hearts.