Hello, I hope I am not offending. I am not a parent, but this feels like the right forum for my situation. I have, and have only partially grown up with, an extremely, extremely troubled older sister who will be coming to stay with me for six months (against my will, but that is par for the course). Extreme - physical, violent - aggression, alcohol abuse, and manipulative behavior are the main issues. She is 6 years older than me, but parent/child roles have ended up very inverted in my family. I will probably end up supporting her financially, and want to keep her away from trouble as much as I can. My mom and I have done the best we could to support her and each other, and still do, but I am now alone and in a foreign country. My sister has many friends (of the not-so-good kind) here. She says she has a job, but from what I've now heard, I gather this is a lie. I do not have a support network myself. I want to be able to deal with this - with my sister - without having it escalate to the point it has in the past, or worrying my mother in any way. Keeping my internship (it is until June, and crucial for my finishing college), not going crazy, and surviving in one piece is just a bonus. She is too old to be considered a teenager anymore, but I do not exaggerate when I say she emotionally is. I know that I will have to set boundaries and be consistent in my behavior from day one, or it will quickly escalate into her being violent against me, herself, any material object in her way, at the slightest perceived provocation (not having her dinner ready in time; looking directly at her; etc). I also know I will need help to stand my ground. I understand if this forum isn't geared towards me and my situation, so please delete this post if it is out of place. Let me just say that I recognize so, so much from the threads I've read here. I think it would help keep me sane to know I'm not the only one that knows how much terror an unbalanced kid in the family can cause. It's not exactly something one can discuss with the neighbor, either: it's like a can of worms hidden in your heart. My admiration goes out to all of you, no matter what kind of can you are struggling with. I know the toll it takes.