loving one parent more than the other

I think your feelings are normal given your situation. It's not that you don't love your mom; you probably just feel a little resentful that she was never there to support you because she was always the one needing support. It's natural that you would feel more attached to your father because he was the one who was always there for you. However, I believe that you should try to strengthen your relationship with your mom by spending more time with her and trying to see things from her point of view.