Remember the old adage....you need to stay away from people, places, and things. For the sake of your sanity/sobriety it seems like you need to get away from your sister.

One of the hardest part of getting and staying sober is having to cut people out of your life who are using. Especially when it's family! Talk to any long time AA/NA member about the friends and family they've lost over the years. Sad stories, but they are important ones.

Take care of yourself. emmy