Do you love your mom?

Would it be ok to you if she was on the street as long as your dad kept his money?

Sounds like your whole family has issues (we all do), and your mom may truly be mentally ill. But I agree with the others, step back and try not to get into your parents divorce. It's ok that you really support your dad, but badmouthing your mom will not help him, you or your mother.

I second the alanon meeting. Go. I promise you will have a revelation.