Your Sister's Sister
 Your Sister's Sister is a 2011 American comedy-drama film written and directed by Lynn Shelton and starring Emily Blunt Rosemarie DeWitt and Mark Duplass. The film is about a woman who invites her male friend to stay at her family's island getaway after the death of his brother. At their remote cabin the friend's drunken encounter with the woman's lesbian sister leads to interesting revelations and developments in all three of their lives.