In the throes of chemo, Kitty is thrilled when a surprise visitor comes to town, while Sarah finally realizes that she has to tell her kids about Luc (Gilles Marini as Luc Laurent). Meanwhile, with Ryan and Rebecca’s help, Holly finds a way to keep her financial future from unraveling, and Kevin and Scotty finally agree on a possible surrogate.

Sarah has a new romantic interest for the first time since her divorce; Scotty and Kevin await the results of their first try at surrogacy; Kitty and Robert reach another impasse over politics.

Nora finally gives in to her feelings for Brody, which leads to a spontaneous romantic getaway. Meanwhile Sarah and Luc closely consider growing their family, and a chance encounter with Michelle raises Scotty's suspicions about her whereabouts for the past several months.

Parenthood is questionable for more than one member of the Walker family, as Justin keeps a closely guarded secret about the true paternal identity of one of his siblings and Scotty makes a shocking discovery that will bring a new life into the Walker family fold.