I hope you're also asking for advice from somebody/some group that is more qualified than a computer forum, if you really need it and arent just venting anyway.

My parents divorced when I was 3 or 4, I know I was 4 when my mother and I moved, but the details of the divorce are sketchy to me. For a very long time I would see my father every other weekend, both parents badmouthed the other until I was about 10 when I told them to quit it. Something about a ten year old child telling you to stop badmouthing the other parent can hit home I guess, because both of them quit. Long story short, I'm fine. If the father plays video games with your son all night then he needs a friend, not a child, do what you think is best for the kid. Let him know that his voice is heard, so he is allowed to have an opinion about where he would want to live, but also let him know that he doesn't get to decide that.