Changed my name for this; I'm a semi-regular and it may be clear who I am but covering my tracks just in case...
My sister is coming for Christmas and I'm working myself up into such a state about it... we have a really bad relationship, but one that is on the surface supposed to be great IYSWIM, though we both know it's not. I am the successful, happy one with a man and a lovely DS and she is depressed, single, desperate for a family and very resentful. Since i had DS it has got harder. She does this weird combination of trying to get my approval with loads of excessive presents, trying non-stop to help around the house in a way I wish she wouldn't, sucking up to me and constantly telling me how great I am, and slagging herself off (drives me mad), and at the same time making nasty digs at me and making me feel guilty all the time. It is a bit single white female - she's always saying she wants to do her make-up like me, get into the same line of work as me etc. and inside I'm screaming "F*CK OFF, leave me alone!"
I know all this sounds trivial, and it would be except that I feel she is sooooo delicate and on the edge that I can't be honest with her and say "oh shut up, enough of the guilt trips" etc. This is why I bloody invite her, because it means so much to her to come and to see DS etc and because I am terrified that if I'll reject her I'll push her over the edge. This year she has been more depressed than ever and my worst fear - I know how extreme this sounds - is that she will get like one of those killer dads and kill herself and DS to get back at me. I know I must sound mad but I'm getting myself into such a state and trying to think of excuses for how I can sleep in DS's room while she's here and so on. DP thinks I'm daft and I can see his point - but she's been violent and abusive to me in the past (basically whenever I didn't give her my approval or tried to reject her - admittedly a long time ago now) and I really am scared of her.
I don't know if anyone can help, or has even read this far! - thanks if you have. Just need to let it out really.