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.

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

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 heads to Cleveland to make things right with Rebecca on the night of her first big gig with the band. Randall, Kate and Kevin make big decisions about their futures.

Kate visits Kevin on the set of his movie. Randall and Beth get exciting news. Rebecca tries to reconnect with Jack.

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 surprises Toby at work. Kevin and Randall attend a charity fundraiser for Sophie's hospital. Jack takes the boys on a camping trip, leaving Rebecca to deal with some unexpected news.

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.

Rebecca finds solace with an old friend as the Pearsons struggle to cope with tragedy. Jack teaches Kevin and Randall to drive.

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.

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.

The Pearsons gather to celebrate their 40th birthday while musing about the day they were born.

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

As their paths cross and their life stories intertwine in curious ways, we find that several of them share the same birthday and so much more than anyone would expect.

Rebecca makes a surprise visit to Randall's home where she encounters his biological father, William. Kevin anxiously decides to take the plunge and move to New York to pursue a Broadway job, with the expectation that his sister, Kate, will move with him. Toby is determined to get Kate out of Kevin's shadow. Jack and Rebecca take home their babies from the hospital and adjust to the new life of parenthood, while coping with the loss of their other child. Rebecca struggles to connect with their adopted child and searches for answers.

As the birth date of her triplets quickly approaches, a frazzled and emotional Rebecca forgets Jack's birthday. Dr. Katowski struggles with the loss of his wife and wonders how he'll be able to continue on with his life without her. Joe, the firefighter who delivered baby Randall to the hospital, fights to save his marriage.

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.

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

Kate interviews for a new job that seems just about perfect, although it comes with a catch. Randall doubts his career choice and wonders if he followed the right path. Kevin and Olivia's relationship moves in a new direction. Rebecca and Jack are conflicted on what to do when Randall tests as a gifted child.

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.

The entire Pearson family gathers at Randall's for an unusual party. Kevin and Sophie's relationship deepens on the night of his play's premiere. Kate struggles to open up to Toby about her father's death. Tensions are high between Jack and Rebecca as she leaves on tour with her band.

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.

As Kevin stresses about the premiere of his play, he receives support from an unexpected source. Randall struggles under the pressure of both his work and ailing father. Rebecca and Jack's Valentine's Day doesn't go as planned. Toby and Kate decide to dig deep and get to know each other's biggest secrets.