Originally Posted by Rain Man
It seems to me like he shouldn't push you out of your own family. Just go and keep your distance from him. Your mother will eventually have to be the one who makes the final call on the guy, and you can't control that.
I like this approach best of the ones posted so far. As long as your mother wants him there, I don't know why you (tooge, not Rain Man) think it's a good thing to put her in a position of having to choose between the two of you.