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.

As Jack, Rebecca and the three kids make their way to Rebecca's parents' house for their traditional Thanksgiving holiday, an unforeseen detour occurs. Kate makes two drastic life-changing decisions. Kevin brings Olivia to Randall's house for Thanksgiving. Randall's heart is broken when he learns about a lifelong secret his mother has kept from him.

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.

Toby throws a wrench in Kate's weight loss journey. Randall struggles to accept his father's deteriorating health. Miguel and Shelly break some devastating news to Jack and Rebecca, which makes them worry about their own relationship. Rebecca receives an amazing work opportunity. Kevin examines his romantic past.

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

It's the Big Three's 37th birthdays. Randall and Beth debate a big life change, Kate takes the first step in pursuing a new passion, and Kevin balances the demands of his career and relationship. Meanwhile, Jack and Rebecca deal with the fallout of their big fight.

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.

Randall adjusts to the foster system. Kate and Toby take the next step in their relationship. Kevin visits Sophie in New York. Jack and Rebecca finalize Randall's adoption.

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

Randall hosts a Super Bowl party while Kevin and Kate reconnect with the past.

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

Kevin and Madison navigate their engagement as Kate and Toby take a big step in their adoption journey. Jack and Rebecca brace for puberty.