Next time your mother starts saying hateful things about your dad, reel back and slap her as hard as you can in the face. Then tell her to stop being a spiteful crack whore and be a goddamned human being for once in her life. Then the next time she's doing drugs, call the cops and have her arrested. The last thing you need while trying to take care of an ailing parent is another parent causing all kinds of problems like that.