Ted Bundy's mother also had an unusual relationship with her son. She had him out-of-wedlock. There is a theory that he was the result of incest, but I have no reason to believe it without solid proof. Anyhow, his grandpa put a lot of pressure on is daughter, Ted's mom, to give Ted up for adoption, but she refused. Then Ted's own grandpa adopted him. And later, when Ted's biomom married, she took him to her new family. Bundy was her husband's name. Of all kids, mother always favored Ted. She suffered so much to have him.
I feel sorry for her. She must have blamed herself immensely later in life.