I would work to remove myself from such a toxic person/situation. It doesn't matter what's wrong with your mother, you can only live your own life. If you parents have a bad influence on you, then get working on your own life interests and activities. Being involved with one's own stuff leaves less time to be tangled up with other peoples'.

This book changed my understanding and helped me deal with my abusive stepmother: http://www.amazon.com/Napkin-Notes-M.../dp/0960255206