"And they keep sinning, good God!" and they have no resolve to correct. The funniest French family returns to disarm us with humor again in the third part of the big hit "For what sins, good God?". This time, new in-laws join the hit team led by Christian Clavier, which means more trouble for the heroes and even more great fun for the viewers! 40 years have passed as one ... sin? The Verneuil family has something to celebrate - such a marriage internship is no joke and, according to their daughters, a great opportunity to organize a grand surprise party. To make it even more fun, the parents of Rachid, David, Chao and Charles come to parties from all over the world. If the Verneuils thought that four extraordinary son-in-law is too many, they will only be surprised ... Look after them all, good God!