The Fatted Calf(1939)

Original title: Le Veau gras

Jules Vachon, a pharmacist, has two sons, Gabriel, a steady-minded young man dedicated to his job in the pharmacy, and Gaston, a good for nothing whose only talent is to seduce rich women and take money from their pockets. But it is Gaston who is hailed as a great man when he returns to his native village thanks to his deep pockets.