Just as she is getting used to having a relationship with her father, Arthur, Megan is thrown for a loop by the return of her mother, Shelby, 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 impulsively ran off and got married to a man Megan can't stand. Will finds it hard to understand Megan's complicated family issues, and is jealous that Megan seems to prefer discussing her problems with Charlie. Meanwhile, Sage denies that she is attracted to Luis, so Rose and Marco 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, a boy Rose already likes.