My uncle had 5 children and lots of grandchildren.
We was very wealthy, also not a very nice man. He worked away and there were many other women, who knows if there are other children? One of his sons is like him and has at least one child outside his marriage.
Uncle has left a will writing out the children and splitting everything equally between grandchildren, but hasn't said who those grandchildren are.
What happens if there are grandchildren the family don't know about? What about the known "illegitimate" one?