To celebrate Yves 50th birthday, his friends plan to take him to the sunny paradise of Paros in Greece. But due to a cancelled flight, the holiday will take place in a far less glamorous and much rainier destination: Yves family home in Brittany. During the vacation, their bonds are challenged by Antoines constant complaining, Yves pride, Baptistes superstition and Laurents jealousy of Jean-Michs perfect life and family. On top of that, Antoines supposedly harmless joke  offering Yves a DNA ancestry test  has unforeseen consequences
