
Stéphane Petitbourgeois is having trouble with his son-in-law Hubert, who has an extra child every year and is expecting his ninth, making thirteen people in the same apartment. However, a competition promises twenty million to the youngest grandfather of twelve grandchildren. Stéphane begins to encourage Hubert. But Pat became sterile from that day on. Finally, after two years, a child is announced. In fact, triplets were born, and after a few twists and turns, Stéphane became the youngest grandfather of twelve grandchildren.
Cast

Jane Sourza
Isabelle Petitbourgeois, la femme

Raymond Souplex
Stéphane Petitbourgeois, le mari expert-comptable

Louis de Funès
Célestin Ratier, représentant des industries de l'enfance

Jean Carmet
Hubert, le beau-fils

Andrée Servilanges
Geneviève, dite Mademoiselle, la nurse

Andréa Parisy
Pat, la fille

Marthe Alycia
Daphné, la mère d'Hubert
Florence Blot
l'employée de l'état civil

Saint-Granier
lui-même
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