La femme de Gilles (2004)

Gilles' wife, Elise, who smiles when she thinks of him, cooks and scrubs and cheerfully makes love to him, suspects during her third pregnancy that he is having an affair with her coquettish younger sister, Victorine. Elise suffers, usually in silence. She listens to her husband rave; she asks her priest; she breaks picture frames; she weeps. She decides on a strategy to keep him. Will she succeed?