Les jambes en l'air (1971)

Story of a marginal couple, César and Favouille, who set out to find their youngest daughter, who run away from home…Some friends join the couple and their two other children. And the search begins to turn into a sort of party. New relationships develop within the family and the group. Tensions, needs and desires all pressure them to conform to laws and accepted behaviour. But freedom cannot be negotiated; freedom is seized. imdb