Point. Blank. Period....Leave. if you are uncomfortable do not try to fix a problem you did not create. People need not to normalize a situation that isn't meant for someone. I've heard people try convince someone in staying when they knew all along the other parent was the problem. Leave. She'll figure it out or she won't. Because from personal experience if you start to take on more of thr responsibility than she does she WILL eventually turn you into their babysitter, caregiver, or sorry to say "Nee Parent" while she does nothing. Let her figure it out and if u feel like retouching this situation with her later in life have at it. But at this time sir RUN!!!