I parenti terribili (1948)

Young Michel is in love with the attractive Madeleine, so he decides to tell his parents of his intention to marry her. He thinks his announcement is innocent enough; his engagement, however, threatens to reveal dark secrets lurking within his family's home. Yvonne, Michel's overbearing mother, concocts an elaborate scheme to drive Madeleine away, thus keeping uncomfortable household truths from being exposed.