After the legalization of gay marriage in California, Mitch and Cam plan their perfect proposals, not realizing that the other has something planned. Cam calls for the help of Jay and Gloria and Mitch rallies Claire and Phil to help make their evening perfect. Phil and Claire try to get a kid-free week for themselves during the holidays by strategizing an overlap of the kids’ summer activities.
It's Manny and Luke's first day at high school and both Phil and Gloria don't want to let their sons go. Confiding in each other, Phil and Gloria end up as extras in a commercial. Elsewhere, Claire joins Jay's company and Cam subs as Alex's history teacher, who both have issues in their new positions. Claire tries to win the employees’ friendship, and pushes Jay away.
Cam and Mitch start planning their wedding; Lily is worried about her cat, Larry, who hasn't come home for days; Phil has a new target group of clients in the form of newly divorced women; and Gloria is worried about little Joe being evil after some things he did. Jay and Manny argue over Jay’s temperamental behaviour.
Cam's sister Pam (guest star by Dana Powell) comes for a visit and Cam and Mitch struggle on how to tell her they are getting married while she holds the secret of her own engagement to Cam’s former crush; Claire convinces Phil to skip Luke's soccer game while Gloria refuses to admit that she needs reading glasses. Claire ends up going to the soccer game and Luke gives his best performance so far, which makes her feel guilty about making Phil not attend.
Jay has made reservations for the whole family at a new restaurant that he has waited to go to for months. However, everyone seems to be running late: Gloria takes forever to get ready, Claire becomes paranoid about letting Luke stay home alone and Cam and Mitch fight after they both wear the same outfit. Elsewhere, Alex babysits Lily; and Haley spends the night with Manny and Joe.
Gloria tries to find a new nanny for little Joe and ends up hiring a male nanny — something that Jay and Manny don't like; Phil's dad, Frank, stays with the Dunphys for a while after his break-up; Cam and Mitch ask their friend Pepper to plan their wedding.
The family attends the annual school fair and Phil has a big 20th wedding anniversary surprise planned for Claire at the fairgrounds, but unfortunately, she simultaneously has a surprise for him back at home. Gloria signs Jay up to be a fair cop for the day and it gets worse when he's partnered up with his nemesis. Elsewhere, Mitch, Cam and Lily try to enjoy the fair but Cam is in a funk from the football team's recent losing streak, and Haley has an awkward first encounter with Andy.
With some urging from Claire, Jay begrudgingly agrees to return to ClosetCon this year, and things get interesting when Jay is reunited with some old colleagues. Cam takes Mitch and Lily to the Tucker family farm for the first time and is excited to fold them into country life, that is until Grams pays an unexpected visit. And back at home, Phil, Gloria and the kids get into some mischief involving Jay's very delicate Apollo 13 spacecraft model
Cam gets ready to coach an important football game that could break a record, but his intensity blocks out the fact that the other team is at a disadvantage. Mitchell tries to quit his job, Phil desperately tries to sell a house, and Claire doesn't want her father's help at work. Haley tries to fix the fact that Alex is ignored amongst her fellow students.
Jay takes Manny out to cut down their own Christmas tree, and Gloria is on edge with her mom in town, but changes her tune when she sees her bonding with Claire. Elsewhere, Mitchell is forced to do last minute shopping when they didn't get Lily the right gift, and Cameron takes Lily to a charity event where they experience the true meaning of Christmas.
Phil tricks Luke into taking a dance class, but the joke's on him when the white lie indirectly lands him in the slammer. Meanwhile, Jay and Gloria are throwing birthday parties for both Manny and Joe and are concerned Manny might be going for girls out of his league; Mitch and Cam get a rude awakening in the cutthroat world of booking a wedding venue. Haley takes Alex for a driving lesson.
Claire suffers from pressure during Alex’s high school open house, while Jay teaches Phil how to play hooky. Gloria butts heads with a fellow mom (Jane Krakowski), Luke and Manny date twins, Mitch meets his new environmentally-conscious neighbor (Jesse Eisenberg) and Alex goes to see a therapist on her birthday after a mental breakdown.
Phil and Claire take Haley out to dinner to discuss her future, but she manages to turn the tables. Jay's friend Shorty and wife Darlene are back visiting, and they have some news that does not sit well with Jay. Mitch and Cam decide to have a nice romantic dinner date, where they don’t talk about the wedding or about Lily, leading to a lot of awkward silence; they end up making friends with the people on the table next to theirs.
Claire and Phil try to spy on Luke to see where he is going as they suspect that he’s smoking pot, while they ask Alex to spy on Haley, where they learn about the photograph exhibition Haley is taking part in. Mitch tries to hide a piece of gossip from Cam with little success and Gloria thinks that Jay was dreaming about another woman in his sleep.
Jay, Phil, and Luke find out unfavourable men in each of their lives are more connected than previously thought as they arrive at Luke's wrestling match. Claire catches lice from Lily after Mitch and Cam fail to warn her in order to get Lily picked up from school as a favour. Haley and Alex battle with a possum. Manny is ashamed of Gloria's presence at a museum class trip.
Cameron is in charge of the school's big spring dance, but when a popular teacher returns from sabbatical, a bit of not-so-friendly competition blooms. And with Claire on chaperone duty at the dance, Phil gets Haley to accompany him to his annual realtor's banquet and is looking forward to impressing his little girl. Elsewhere, Mitch starts a new job and can't seem to get a good read on the new boss or the work environment. Jay and Gloria babysit Lily and an accident with Gloria's purse ignites
It's male-bonding day when Jay takes Luke into the garage to show him the way around tools and impart some manly wisdom, and Gloria goes with Claire and Lily to shop for Lily's flower girl dress. Elsewhere, Mitch, Cam, Alex and Manny go for a cultured day at the museum but it eventually becomes survival of the smartest. And Phil enthusiastically offers to help Andy with his anniversary gift to his girlfriend, which is an elaborate video expression of his love.
he adults are Vegas-bound when Jay hooks them up with Excelsior Level hotel accommodations courtesy of one of his big clients, but after learning there's an even higher level, Jay becomes obsessed with upgrading. Meanwhile, everyone's sneaking around when Claire secretly hits the tables to win back money she lost years ago, Phil goes underground auditioning for a secret society of magicians, Cam ducks out of a spa day with Mitch to join their friend's bachelor party shenanigans, and Gloria is de
Mitch struggles to hide his true feelings about the unflattering wedding topper Cam's father whittled out of soap for them, Phil tries to help Gloria sell her pre-Jay apartment but they get sidetracked at the neighborhood salon, and Claire and the kids head over to Jay's early to help him prep for the special night with the family he's hosting but they end up just butting heads.
The family travels to Australia as Phil tries to fulfill his mother's wish for him to visit the country where he was conceived. Unfortunately, Phil's attempts to embrace his native land are met by a lot of rejection, while Jay and Claire let work eat into vacation time, and Mitch and Cam get reacquainted with an old friend (Rhys Darby).
Phil fails at his one task to stay home and wait for the repairman, forcing him to tell an elaborate lie to hide the truth from Claire, but the stress is more than he can physically handle. Meanwhile, Gloria is obsessing over the family portrait she is responsible for organizing this year. Claire accuses Cam of being too snobby to use her girls' hand-me-downs, and Jay secretly enters Stella in a dog show.
Jay, Gloria and Manny challenge each other to step through their comfort zone. Mitch and Cam's wedding is getting too big and costly so they resort to selling a couple of their prized possessions, and the kids play a joke on Phil and Claire.
Cam and Mitchell's wedding arrives, but their big day gets questioned when things go wrong. Gloria and Jay give relationship advice's to Cam's parents, and things take a turn for the unexpected. Phil and Claire get to know the kids better and Haley puts herself in the middle of a relationship breakup.
The wedding day chaos continue as the entire party shifts from one contingency plan to another. Guests start to get testy, Mitchell and Cameron are feeling discouraged and poor Claire shows physical wear and tear, but an unexpected turn of events leads to the ceremony we've all been waiting for.