According to the mess and noise she causes during her visit for her twin brother, Jack Sadelstein, a successful advertising executive in Los Angeles, who has enjoyed a comfortable and quiet life with his beautiful wife and cute kids, Jack struggles against the visit of his sister, Jill, during the Thanksgiving Day.
Sandler has become a good actor of late, but here he gives over most of his talents to Jill, who is so screechy, needy, and lovelorn that you can hardly blame Jack for wanting to fade into the background.
Jack and Jill is an ill-advised, too long Saturday Night Live skit gone wrong. It's a cartoon. It's a way for all involved to pad their pockets and a way for Sandler to keep his friends employed.