Something tells me this is abll aout a girl, and you really only wanyt to move in with your dad because it's convenient. If that's the case, you're totally messed up about calling your mom's house a hellhole in a previous post. But if that is not the case and you want to move because of say her spouse or boyfriend, let her know. If you don't feel safe around him, tell her, your safety should be her main concern. And if she doesn't do anything about it, then tell your dad and I'm sure he will do something about it.
theres more reason to moving there also, its a bit personal though..