But the 15 year old son didn’t turn his father in either - only verified the use of the shock collars.
My opinion? He gets a jail term with the father: for aiding a crime for many years. (He may have been in on the rapes as well.)
I would imagine that the 15 year old son knew that he had a monster for a father and feared what would happen to him.
Give the kid a break. That whole household was probably terrorized.