IFC's latest comedy, YOUR SISTER'S SISTER starring Emily Blunt, Rosemarie DeWitt, and Mark Duplass opens in select theaters today. The film tells the twisted tale of ever-complicated relationships that are set in motion with raw, hilarious and emotional performances from the all-star cast. Don't forget to check out YOUR SISTER'S SISTER this weekend in a theater near you. For a complete list of screenings please visit: http://on.fb.me/La1BNn See what director Lynn Shelton has to say about the film after the Jump... Emily Blunt, Rosemarie Dewitt and Mark Duplass star in YOUR SISTER'S SISTER, a new comedy about romance, grief and sibling rivalry. A year after his brother Tom's death, Jack (Duplass) is still struggling emotionally. When he makes a scene at a memorial party, Tom's best friend Iris (Blunt) offers up her family cabin on an island in the Pacific Northwest so Jack can seek catharsis in solitude. Once there, however, he runs into Iris