Quartile rating: 6.5/10 · 1 rating
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 is a naturalistic mumblecore relationship drama elevated chiefly by its three lead performances. Mark Duplass, Emily Blunt, and Rosemarie DeWitt bring remarkable authenticity and chemistry to their intertwining characters, making the film's improvisational dialogue feel genuinely alive. The plot is a tightly contained three-hander with some clever complications around the love triangle and grief, though it never fully transcends its stage-like limitations. Cinematography is functional but unremarkable — handheld and low-budget without much visual distinction despite the picturesque San Juan Islands setting, a missed opportunity. The film's mumblecore sensibility and the female director's (Lynn Shelton) intimate approach give it modest novelty within its niche. The ending, however, feels rushed and somewhat unsatisfying, tying up threads too neatly given the emotional complexity that preceded it.