When an old neighborhood kid returns to town as a hugely successful internet billionaire, it gets Phil thinking of what could have been. Jay feels Manny could use a little dose of constructive criticism, and Cameron is offended when Mitchell questions the authenticity of his colorful childhood stories.

Phil's preoccupation with a business opportunity blinds him to his new partner's inappropriate behavior around Claire. Meanwhile, Jay and Gloria may regret letting Mitchell and Cameron be their temporary house guests when their home is being fumigated.

Claire's race for town council comes to a head on Election Day as the Dunphys make phone calls for votes and Mitchell and Cameron take to the streets to campaign, while the candidate endures technical problems during some last-minute interviews.

Mitch and Cam try to save an old tree in the park. Jay takes Manny to a kid's Olympics-themed birthday party. Gloria and Claire have an eventful shopping trip.

Claire and Cam bring in a third party (Wendi McLendon-Covey) when they reach an impasse on a landscaping decision; Phil teaches basic fix-it skills to the kids; Mitch helps Lily with a bully.

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

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 a case of whodunit and it’s Lily’s word against baby Joe’s.

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.

Mitch and Cam’s big day is finally here and nothing can ruin it, until nothing turns into a whole lot of somethings and puts wedding planner extraordinaire Pepper Saltzman to the test. Meanwhile, Jay and Gloria host the Tuckers, Phil squeezes in an eye procedure before the festivities and Claire embraces her role as “best woman".