what to do with a drinking twin

I know how you feel, you want to just come flat out and tell her STOP your not only hurting your self but every one around you when you act like that, but you cant because you will only push her away. I would try taking her out and showing her a good time that doesnt involve drinking, and how fun it can be sober. It wont be easy, but dont just push into change because you will just cause friction. The best way is to let her understand that she has a problem and that her behavior is unxceptible. Once you gently tell her that, you might suggest her seeking help in a such ways as a AA Club, that way she can get over her addiction. as for the threat aginst your baby sister, has your twin had a history of violent behavior, if not that stress the improtince of setting an example for your baby sisters sake. and REMOVE THE THREAT!!! because child abuse is never acceptible. I hope that I helped and GOOD LUCK!!!