- Country: USA
- Genres: Comedy, Drama
- Release: 2012-06-29
- Director: Lynn Shelton
- Writers: Lynn Shelton
- Language: English
- Stars: Mark Duplass , Emily Blunt , Rosemarie DeWitt , Mike Birbiglia
- Runtime: 90 min
- Awards: 2 wins & 8 nominations.
- AKA: Ma meilleure amie, sa soeur et moi (France, French Republic) , Your Sister's Sister (United States of America) , Édesnégyes (Hungary) , Tvoje sestre sestra (Serbia) , Meine beste Freundin, ihre Schwester und ich (Germany) , Your Sister's Sister (United Kingdom) , Ha'ahot shel ahot'ha (Israel) , ラブ・トライアングル (Japan) , Siostra twojej siostry (Poland) , 忽然搭上妳家姊 (Taiwan) , Sora surorii tale (Romania) , Η αδερφή της αδερφής σου (Greece) , Your Sister's Sister , Сестрата на сестра ти (Bulgaria) , Сестра твоей сестры (Russian Federation) , El amigo de mi hermana (Spain) , Tavas maasas maasa (Latvia) , A Irmã da Sua Irmã (Brazil) , Entre Irmãs (Portugal, Portuguese Republic)
- Plot: Mourning the death of his brother, Jack's friend Iris invites him to her father's cottage for some alone time to recuperate. Unbeknownst to either of them, Iris's sister Hannah is also staying at their father's cottage recovering from her recent break-up. One entire bottle of tequila later, Jack and Hannah wake up to find Iris at the door. They each have secrets that they're tying to keep and they each have feelings that they're trying to sort out.
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