I don't know what advice to give you, but wanted you to know that I read your post and I feel for you. It sounds like you see through this guy. Stay strong. Don't give in to him. If he threatens you, report it to CPS or someone. Maybe keep a running list of the threats and especially witnesses. He'll keep trying to intimidate. Don't give in to it. If he does this it is because it works for him sometimes. He's especially not going to like witnesses and proof of what he is doing. You don't have to tell him, just quietly keep track so that your case is solid. Do you need the child support, or could you dismiss him from your life entirely? He doesn't sound like he is helping your son at all, and also doesn't seem to care about being a father - just about the money.