I replaced 10 with 9 because of the following consideration. If a man says his grandmother has 10 children, then obviously one of the children must be the man's father or mother and the other 9 his uncles and aunts. It's not mockery, it's just common sense, Vinnieвы издеваетесь надо мной, или что-то не так?
Of course, we don't know how many of the 10 children are still alive.