Accepting a gift from one's na baaligh sister
Q: I was studying Arabic and my sister, who was about 11 or 12 years old, gave me an Arabic learning book that my uncle gave to her. I would use this book for my class and then at some point after, I mentioned to my father that she gave me the book and my father didn’t object to that.
I have recently been told that this was not a valid gift and a Wali can’t hand over the property of the child and that the gift of a child to an older person is not permissible. The father is also not allowed to give or allow the gift of his child without something in return. If at the time I thought this was valid, such as the Wali knowing (my father), what should I do?