Toby helps Kate relax in the midst of her fervent quest to lose weight. Beth questions the motives of Randall's biological father, as Randall adjusts to having his dad in his life. Rebecca and Jack begin to feel distant from one another. Kevin faces the consequences of quitting his job.

Rebecca and Jack get into an argument about starting a family. The family backstory behind the long line of love for the Pittsburgh Steelers is revealed. After accepting his part in the play, Kevin realizes his script is relevant to his own life. Randall and Beth encounter an unexpected turn of events.

The dynamic of Randall and Kevin's rocky relationship is explained. Beth and William spend time together, which unexpectedly brings to light a secret William has been keeping. As Rebecca gets back to work for the first time in years, both she and Jack acknowledge that there is distance between them. Toby is caught straying from his diet regimen, throwing Kate into crisis.

Kate, Kevin and Randall head to their family's cabin to get away after their chaotic family Thanksgiving. A very angry Randall finds comfort and explanation from his father, Jack. Olivia speaks a harsh truth to Kate, which drives a wedge between Kate and Kevin. Rebecca and Jack struggle with what to do when 9-year-old Randall tells them that he's been looking for his birth parents.

Kate struggles with her feelings in the aftermath of Toby's heart attack. As William begins to spend more time with Jesse, Randall has to get used to his father's new relationship. After receiving the news they're expecting triplets, Jack and Rebecca must find a way to afford a home that can accommodate three babies. Olivia unexpectedly resurfaces, throwing both Kevin and Sloane for a loop.

Jack and Rebecca get in over their heads when they decide to throw Kate, Kevin and Randall three separate parties for their 10th birthday. Randall struggles to make time for William as things intensify at the office. Kevin makes a major decision in his romantic life. Kate's gastric bypass journey takes an unexpected turn.

Randall and William take a road trip to Memphis, where Randall learns about his biological father's past.

The entire Pearson family visits Kevin on set in Los Angeles for a "Manny" taping. Jack confronts his demons in the wake of his fight with Rebecca.

Randall and Beth adjust to a new family dynamic. Kate books her first big gig. Kevin suffers a setback on his movie. Jack and Rebecca are visited by an unwelcome guest.

Trick-or-treating with the 10-year-olds goes awry for Jack and Rebecca. Randall, Kevin and Kate have life-changing Halloweens.

Kevin goes back to his high school to accept an award. Jack and Rebecca get excited about their kids' futures.

Kate and Toby's lives take an unexpected turn. Meanwhile, Rebecca encourages Kate's singing aspirations.

Randall and Beth are faced with a hard choice. Jack takes Randall on a college tour.

Kate goes wedding dress shopping. Kevin embraces a new lifestyle while Randall explores William's past. Jack and Rebecca take the kids to the mall.

Kevin helps Randall and Beth with a project. Kate contemplates a big gift for Toby. Jack and Rebecca talk about their future.

Kate and Toby go to Las Vegas for their bachelor/bachelorette parties. Meanwhile, Jack and Rebecca celebrate their wedding anniversary.

The Pearsons come together to celebrate Kate and Toby's wedding. Wedding planners Kevin and Randall struggle to pull off the big day. Kate is flooded with memories of Jack. Deja struggles to adjust to her new living situation.