It does strike me as rather inappropriate to post your woes in a forum thread, Cate, especially if the person you're moaning about also reads the posts.
Wouldn't it have been better to approach your sister about these topics rather than ranting off the top of your head and saying things that, by all indiciations, are either false or exaggerated.
Hiding behind a forum alias and twisting tales isn't exactly the most honourable thing to do, is it? Thus, you are not doing yourself any favours.
Just think about it and next time you have a problem with someone, talk to him/her about it or else keep your mouth shut.
Cate...you could move out.