It's been a year since the death of the family patriarch and a mere three weeks since the Walkers last heard from Justin, who is stationed in the Middle East, but through it all, the family tries to celebrate Kitty's birthday. Sarah continues to try to salvage her marriage. Meanwhile, Tommy struggles to support Julia, who is still hurting after the death of their newborn son; Kitty is faced with the challenges of being engaged to a US senator; Saul has questions after a visit with an old friend; and Rebecca continues to try to find her place as a Walker.

Kevin, Kitty and Nora head out on a road trip to pick up Justin as Kitty tries to balance her personal and political life with her future husband. Meanwhile, Tommy struggles being a father and Rebecca's secret is exposed.

Nora and Rebecca team up to help Justin through his pain. Julia tells Tommy that she's taking their daughter and leaving for some time away. Meanwhile, Kevin goes to dinner with Scotty and Kitty confronts Robert's ex-wife.

Kitty and Sarah head to the spa for a relaxing break, but their plans soon go awry when Nora tags along. Meanwhile, Rebecca grows suspicious of Justin's quick recovery; Kevin tries to talk Saul into revealing his past; and Tommy looks for companionship.

Sarah must find her inner strengh as she and Joe square off in a custody battle. Meanwhile, Kitty gives the Walker family some shocking news that will change the future course of the family.

The Walkers must cope with a tragic loss; Kitty hires an expert to advise Robert on his campaign; and Sarah rethinks her custody arrangement.

The Walker family comes together to help Justin with his addiction. Meanwhile, Kitty and Robert move forward with a new perspective on their relationship.

Robert enlists the help of a musician to help Kitty get over her sudden cold feet concerning their marriage. Nora reconnects with a man she knew a long time ago as Sarah has dinner with a business consultant. Meanwhile, Tommy has trouble dealing with his guilt and Justin starts a relationship with a questionable person.

A political scandal threatens Kitty and Robert's wedding day. Meanwhile, Isaac distracts Nora from Stan and Holly has a surprise visitor.

Tommy and Julia work to fix their damaged marriage and Rebecca's connection with David begins to raise questions about her mother's past. Meanwhile, Nora and Isaac have their first date.

When Jason arrives for a surprise visit, Kevin begins to rethink his future. Meanwhile, Nora and Isaac grow closer.

Graham helps Sarah with her unhappy past, as Nora takes a closer look at her relationship with Issac, plus, Robert and Jason have an emotional encounter.

Kitty and Robert make a life-changing decision when Robert's Presidential campaign takes a turn. Meanwhile, the Walkers are shocked by Nora's reaction to Isaac's proposal and Rebecca digs deeper into the true identity of her father.

While Robert contemplates his future in politics, Kitty's fertility treatments are increased. Kevin has a realization about his relationship with Scotty. Later, Rebecca reveals the results from her paternity test and Saul makes a risky decision concerning Ojai Foods that could affect the company forever.

In a twist of fate, Holly becomes the only one that can save Ojai Foods for the Walkers following an international business deal gone wrong. Meanwhile, Justin is the bearer of bad news about a family member; Saul makes a shocking confession; and Kevin and Scotty have a life-changing moment together.

Kevin and Scotty commit to each other as life partners as Saul deals with his true identity. Meanwhile, the Walkers learn of another shocking secret William was keeping from his family.