Karisma. I forgot to tell you that this happened to us. For two years a "friend" of mine took in my son and did not require of him one thing--and then kicked him to the curb when he tired of it. I blame him because when it began I called him to try to talk to this person, who answered, "this is between J and I."
The moral of the story: we cannot referee between our children and their lives. It still causes me pain.