So my fiance comes back from a 30 day treatment facility on the 1st. I have no problem never drinking again. My sister and her family rent out my basement. So I told her, there can no longer be any alcohol in the house ever. It did not go over well. She accused me of putting my problems onto her, she claimed she didn't agree to that stipulation, although we have no formal contract of any kind anyway. I told her she was free to move out, she pays $600 for 1800 sqft w/ all utilities included. But her husband doesn't make much at all, she says they are trying to move out but there is no way they could afford it, I doubt they have anything in savings whatsoever. I am trying to think of the best way to approach this when it comes up again. I don't think my sister is an alcoholic, but I never expected her to cling so tightly to what she calls "a lifestyle". I know its my house, and at the end of the conversation I said "No alcohol by the first or the GTFO I don't care either way" Any advice on a more productive way of approaching this situation?