Betrayed by his wife, a teacher proceeds to have an affair with a young and pretty student. The two women both find themselves expecting a child. The girl dies during childbirth. In a spirit of revenge and to keep his real son, the scorned husband exchanges the babies.

The wealthy industrialist Alain de Narbois has disappeared. Michel Dunant, an idle man who passed by and who looks exactly like the deceased, is taken for Alain by a young woman and her servant. He jumps at the chance but quickly realizes that, in this hushed little world, masters and servants play comedy and know very well that he is only a double of Alain. In fact, the industrialist was assassinated.

Madame Célerier is determined to marry off her son François to a rich and haughty woman but François has other plans.

As the red headed boy writes in his school book, a family is a group living under the same roof who can't stand each other.

One day, Raoul Cérusier realizes with amazement that his face has changed. With the exception of an old uncle, no one, not even his wife, recognizes him. From an ordinary, rather ugly man, he has become a charming young man on whom the prettiest girls turn, including his wife whom he seduces. Fortunately, he regains his old face in time and Madame Cérusier, losing a lover, finds her husband again.

Arlette thinks she has made a wonderful gift to her daughter Sylvie, who has just married François Morel, a young journalist. And, to tell the truth, not everybody receives a posh little bar like the Royal Montmartre as a gift. The trouble is that Monsieur Jo, the former owner of the joint is also the boss of a gang of drug traffickers. And that he has managed to persuade the pair of naive lovebirds to drop a painting to a friend on their way to their honeymoon place. Now the picture is stuffed with drugs! The honeymoon trip promises to be eventful...