Claude and Marie Verneuil will soon be celebrating their 40th wedding anniversary. For the occasion, their four daughters — Isabelle, Odile, Ségolène and Laure — decide to organize a big surprise party in their family home in Chinon. They also decide to invite, each, the parents of their respective husbands — Rachid Benassem, David Benichou, Chao Ling and Charles Koffi.

In Paris, Ariane and Lena are sisters. Ariane writes photo novellas for the magazine "Toi et Moi." She's emotional and her long-time boyfriend, Farid, has her in a state because he won't propose, won't ask her to live with him, and often is unavailable. Lena is a cellist, quiet and circumspect in life and in her playing. She lives without passion with her boyfriend François; they're talking about having a baby.

Jean-Pierre Costa is a football manager upon whom fate appears not to be smiling. First, a friend, Annabelle, dumps a pet Labrador named Didier on him whilst she goes off to make a report in Los Angeles. Next, one of his star players is injured, leaving him one player short for a crucial match. As if things could not get any worse, Costa wakes up one morning to find that that Didier has been transformed into a man...

History's favorite Gauls assist Queen Cleopatra when she wagers that the Egyptian people can build a palace for Julius Caesar in just three months.

A catholic French couple sees their life upside down when their four daughters get married to men of different religion and origins.