Looking for a French or Italian (?) Holocaust movie (probably from mid 80s) about two brothers (aged 8-10), who try to escape with their father when the Nazis come to their town. Their father tells them that from now on they will call him his uncle, then asks “Is that understood?”, the boy says “Yes, father”, the father slaps him and the boy says “Yes, uncle”. Then they escape but the Nazis catch them and undress them, asking them why they are circumcised. One of the boys says that they were sick, but the Nazis start torturing them to make them tell the truth. At one point they hang one of the boys upside down from the ceiling. Then they manage to escape or perhaps someone comes to their rescue.