I think it is going to be bad while he is young, because like other posters have said, his father is confusing him. But when the boy gets older, he is going to understand what his father has done to him and he will probably be pissed.
I know I would be if I realized that my father wasn't doing something for my benefit, but to get back at my mother and her relationship. Children are many times used as pawns for hurting the other parent.
Key word there being "used" His father is being really deceptive with his child. Basically manipulating him to get back at his mother, in the guise of helping him. It's a very passive aggressive thing to do.
Because he can say, "Oh, I'm just doing what's right. He should know these thing", when inside, he's thinking, "I'm gonna get that witch for leaving me. If I'm not happy, she's not going to be!"