Looking for a book about this boy in prehistory who ends up befriending a wolf, but his tribe that lives that lives in a cave doesn't like this. There is one older female member that act's like a caretaker to him. At the end of the book it's revealed that the person who I think is the leader of the tribe who shunned him is actually his father. Sorry for the possibly vague description it was quite a while ago when I read this.