Cameron throws a 25th anniversary party for his mother, Colleen, and stepfather, Wendal, which threatens to be a disaster when Wendal confides to Cameron that he's thinking of leaving Colleen.

Colleen learns of Wendal's plan to leave her at their anniversary party, and after discovering that the entire family knew but her, confronts them at their traditional bowling night.

In an effort to be supportive of awkward son Henry, Cameron and the family attend his school film festival, despite Henry's protests. Upon watching the film, it becomes painfully obvious why he didn't want them there in the first place. Meanwhile, younger sister Jenna tries to prove to Cameron that she is a "grown-up."

After 35 years, Cameron and Sharon's father, Merv, returns out of the blue. They decide to have a family dinner to discuss where he's been all these years, but a sudden turn of events leaves their questions still unanswered. Meanwhile, when Jenna finds out that Whitey is dating a stripper, she forbids him from seeing their son.