Jack Sadelstein, a Los Angeles advertising executive, is plagued by an annual family visit from his twin sister Jill, who disrupts his peaceful life with her constant neediness and passive-aggressive behavior.

Jack and Jill
A stressful Thanksgiving gathering is further complicated by the unwelcome presence of Jack's twin sister Jill, who overstays her welcome and wreaks havoc on the family's dynamics with her demanding and subtly aggressive manner.