After ten years of marriage, Philippe and Catherine finally have the joy of having a baby: Julie. For these two extended teenagers, it's the end of night outings and improvised weekends. She is quickly overwhelmed and Philippe, who runs an advertising company, is not often there. On the other hand, the family - grandmother or godfather - is too much. And then she begins to choke. As a fashion designer, she first tries to work at home but can not share herself between her professional and maternal activities. Philippe tries to help her, in vain, then abandons to flee to Deauville for an extra-marital weekend. She will not forgive him and will disappear with Julie. And years go by before the little girl who grew up finds herself again between her mother and her father, accompanying her, for the first time, to school.

It’s summer in a small port town in Brittany. Isabelle (Pascale Rocard), who has just graduated from high school, comes to join her mother Micheline (Bernadette Lafont). Micheline is being courted by a beach boy, Maurice—whom everyone calls Doudoune (Bernard Menez). Isabelle soon begins a sweet romance with one of his friends, Pascal (Pascal Meynier). Meanwhile, her father (Michel Aumont) has stayed behind in Soissons, where he runs a medical laboratory, and is bored to death. Every weekend, he comes to spend 48 hours with Micheline and sometimes splurges a little extra in Paris, hitting on girls in nightclubs. Efforts that are not crowned with success. On the contrary, in Brittany, that ladies’ man Doudoune gets what he wants... But when the family man comes to join his loved ones, the blunders and misunderstandings multiply...