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.