Your Sister's Sister
“A comedy about doing the right thing with the wrong person.”
Where to watch in the United States: Stream: Philo, AMC Plus Apple TV channel, AMC+ Amazon Channel, AMC+ Roku Premium Channel, AMC+, Sundance Now, Kino Film Collection · Free: Kanopy · Rent: Amazon Video, Apple TV Store, Fandango At Home · Buy: Amazon Video, Apple TV Store, Fandango At Home. Streaming data from JustWatch via TMDB; availability changes.
Cast
Mark Duplass 
Emily Blunt 
Rosemarie DeWitt Mike Birbiglia Michael Harring Jason Dodson
Credits
Written by: 
Lynn Shelton
Plot
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.
Sinekatalog’s take
A grieving man at a remote cabin has a drunken night with his friend's sister, and the following days become a delicate comedy about honesty. Largely improvised in feel, it seems natural and intimate. A small, warm film for fans of talky relationship dramas.Sinekatalog’s own editorial review – not a user or critic quote.
Ratings
IMDb: 6.7 / 10 (29,286 votes)
IMDb rating and vote count from the IMDb ratings dataset (October 2026). Scores change over time.
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