Rebecca takes a chance on Jack despite a disastrous first date. Toby makes a dangerous decision to aid his and Kate's chances of conceiving. Beth grows worried about Kevin's new relationship.
The teenage Big Three struggle to adjust after Jack's death. Randall is forced to confront his class privilege. Nerves fray as Kate starts her hormone treatment leading to various fights within the family.
Rebecca receives advice from an unlikely source. Beth and Randall face questions about their respective careers. The Pearsons support Kate while she is being treated.
A look into Jack's past reveals his complicated family life, his relationship with his brother, and the path that led him to Vietnam.
Miguel keeps a promise he made long ago. Toby is driven to the brink as he and Kate await news on her pregnancy. Kevin's dive into Jack's past provides more questions than answers.
As Randall gains a new ally for his campaign, Beth struggles under the pressure of an uncertain future. Rebecca supports Kate after the latter learns that she is pregnant. Kevin makes a trip to learn more about his father's past.
Jack pulls out all the stops to find his brother. Kevin is inspired by his father's story to take an important step in his relationship with Zoe. Jack supports Rebecca in the wake of a career disappointment.
Tess confides in Kate about a personal struggle. Toby invokes Jack's spirit during a Thanksgiving celebration. Randall deals with the rising tension in the ranks of his campaign.
Jack struggles to connect with the disillusioned Nicky. Kevin makes a shocking discovery about his uncle. Beth and Randall's relationship is at a crossroads.
Randall waits for the results of the election. Zoe and Kevin make progress in their relationship. Kate and Toby make changes to prepare for the arrival of their baby.
A terrible tragedy irrevocably damages Jack and Nicky's relationship. Rebecca and the Big Three confront the reality of Jack's secrets. The Big Three meet their uncle.
Randall and Kate reminisce on a childhood memory. Kevin suffers from a relapse while trying to help Nicky.
Beth reckons with past disappointment during a visit to her mother. Randall helps Beth find her path again.
As the teenage Big Three graduate, they make a pact for the future. Randall and Beth clash when he asks her to make a personal sacrifice once again. Kate learns that Kevin has relapsed.
As the family gathers to support Kate, Kevin continues to deteriorate. Randall and Beth are at odds over how to handle their conflicting career paths.
A confrontation with a familiar face forces Kevin to face his mistakes. Randall and Beth's marriage is on the rocks. Toby and Kate struggle to deal with baby Jack's hospitalization.
Randall and Beth's argument turns ugly as they rehash their past, and Beth voices her frustration with the various sacrifices she has been forced to make over the years.
As Tess finds solace in her uncle Kevin, Zoe comes to a realization about her and Kevin's relationship. Deja gives Randall a dressing-down as he and Beth settle on a compromise.