Just as she is getting used to having a relationship with her father, Arthur (guest star John Allan Nelson), Megan (JoAnna Garcia) is thrown for a loop by the return of her mother, Shelby (guest star Lawrence), who abandoned the family when Megan was a child. Megan finds it hard to control her anger toward Shelby, but Arthur makes it clear that he wants Megan to forgive the mistakes made by both her parents in the past. To make matters worse, Megan learns that her sister Lily (Kristina Apgar, who does not appear in the episode) impulsively ran off and got married to a man Megan can't stand. Will (Brian Hallisay) finds it hard to understand Megan's complicated family issues, and is jealous that Megan seems to prefer discussing her problems with Charlie (Michael Cassidy). Meanwhile, Sage (Ashley Newbrough) denies that she is attracted to Luis (guest star Ignacio Serricchio), so Rose (Lucy Kate Hale) and Marco (Allan Louis) come up with a scheme to make Sage admit her true feelings. Sage turns the tables on Rose by setting up a date for her with Zachary (guest star David Franco, "Greek"), a boy Rose already likes.