Family guy Jack Sadelstein prepares for the annual event he dreads: the Thanksgiving visit of his twin sister, the needy and passive-aggressive Jill, who then refuses to leave.

Jack Sadelstein is a successful advertising executive in Los Angeles with a beautiful wife and kids, who dreads one event each year: the Thanksgiving visit of his identical twin sister Jill. Jill's neediness and passive-aggressiveness is maddening to Jack, turning his normally tranquil life upside down.