Felix is a middle-aged bourgeois husband. Much to his discomfort, he learns that his wife Gabrielle is carrying on with a young man--a very young man. Rather than express outrage, Felix decides that there's something lacking in him. He spends the rest of the picture trying to keep his wife by altering his own personality and outlook.
Father Benoît would like one of his twins to take over his inn, at 3 plates. But his ancillary ambitions are not commensurate with his last 3. Bernard is also in love with Hélène, daughter of Colonel Flouc de La Donzelle. He dreams of becoming an actor and goes to Paris to find a job. Difficult beginnings since from the theater, he goes to the cabaret, then to the radio, without success. In the final scene, the 3 brothers meet, which gives rise to a series of gags during the wedding.
For the Marquis Barbezieux de Saint-Rosay, nobility is important. If anything can comfort her, it's her family tree. In order to erase any doubt he invites in his castle a cousin of his established in Scotland, whom he instructs to bring him his titles of nobility. A first person introduces himself, calling himself his cousin, but it's not him. Then one, then two, then three false cousins appear in turn. Will the real Saint-Rosay of Scotland eventually present itself?
Jeanne De Pincret refuses to marry Viscount Haussy De Villefort, having discovered his frivolity. After a duel against the Duke De Montgobert, whom Louis XIV recommended to Jeanne, the king forced De Villefort to marry Jeanne, then sent her to war. Separated from her husband, Jeanne discovers that she loves him.