So my future sister in law previously had a substance abuse problem. This is before I met her - and to be honest, we are not close at all. I'm concerned as this is supposed to be a night I can let loose, and I feel like if she is invited, I am going to be walking on eggshells watching her as we plan to go to a club. None of the other ladies invited know her, so I would be the only familiar face. What should I do?! Any and all advice is appreciated!