Iris invites her friend Jack to stay at her family's island getaway after the death of his brother. At their remote cabin, Jack's drunken encounter with Hannah, Iris' sister, kicks off a revealing stretch of days.
Your Sister's Sister streaming: where to watch online?
Currently you are able to watch "Your Sister's Sister" streaming on Showtime, Showtime Amazon Channel, fuboTV, DIRECTV. It is also possible to buy "Your Sister's Sister" on Apple iTunes, Google Play Movies, Amazon Video, YouTube as download or rent it on Amazon Video online.