what is wrong with his dad? god!
Who's dad? :)
His dad is an alcoholic who has some bad people that he's associated himself with (Ernie Eco). Also, since he's an alcoholic, he has a distorted image of things and he thinks that he is in the right all the time when he really isn't. It also is a reason why he is abusive and aggresive towards Doug, Chris, and his wife. All in all, the cause for all of his behavior can be simply put into one single word: Alcoholism. (Hope this helped a bit!) :)