As the title proclaims, Rachel (Rosemarie DeWitt) is getting married. In the works is a joyful, multicultural wedding -- she's a WASP, her fiance is African American, the theme is Indian -- that promises to embrace everyone into the fold, even Rachel's wayward sister, Kym (Anne Hathaway). On furlough from yet another stint in rehab, Kym's determined to keep it together. But it's not easy, especially when you're confronted by a well-meaning father (Bill Irwin) who hovers and shields the enormous pain he obviously feels, a distant mother (Debra Winger) who's determined to move on even if it means leaving you behind, and a sister who can't quite mask her rage even on the happiest of days. And then there's the past: The consequences of a family tragedy that happened while Kym was high are still omnipresent.