Un été d'orages (1989)

Every year, the whole gather in the French region of Auvergne's home. During this 1944 summer, Louis falls in love with his cousin Laurence. The arrival of a British skydiver, Jack, will completely upset Laurence. Louis, jealous like crazy, will betray the skydiver who will die in front of his eyes. But his cousin François-Xavier has also seen what happened.