Rainbow's quirky, "underachieving" sister, Moonbeam, comes to visit. Highly educated and successful surgeon, Rainbow, is afraid that her hippie sister is infecting Zoey with her "joie de vive" lifestyle and that her family finds Moonbeam more fun. Moonbeam's retention of Dre's firm to create an ad campaign for her new restaurant has Dre performing in tandem with many of Moonbeam's antics, and even cynical Pops isn't above cutting up with her. Normally stoic and reserved, Zoey seems to be mimicking Moonbeam in style and attitude, even allowing Moonbeam to sit on her bed (gasp!) Rainbow makes extreme efforts to prove that she is as cool and as much fun as Moonbeam. Eventually, the family realizes the problem, and reassures Rainbow that she is the perfect mother and wife for their family.