Emily Blunt also stars in Salmon Fishing in the Yemen.

Iris is both Jack’s best friend and his dead brother’s ex – which makes them almost like siblings. A year after his brother’s death, Jack (Mark Duplass) still see-saws between emotionally wobbly and outright volatile. When he makes a scene at a memorial party, Iris (Emily Blunt) intervenes with a plan: Jack must oil up his old bike and trek to her father’s cabin on an island on Puget Sound, where isolation will give his brain a chance to detangle. When Jack gets to the woods, however, he finds not solitude but Iris’ sister Hannah (Rosemarie DeWitt), herself nursing a wounded heart and a bottle of tequila. Their hangover descends in the form of Iris, who pulls up with a bag of groceries the next morning.

Though ripe for love-triangle trappings, Your Sister’s Sister offers an uncontrived navigation of romantic and sibling relationships. Its humour may swing from understated to raunchy, but Your Sister’s Sister is always smart. Duplass is both an endearing goof and poignantly unhinged as a man grappling with the aftermath of grief, while DeWitt and Blunt are thoroughly believable as two very loving, very different sisters. - Jane Schoettle, Toronto International Film Festival