That is horrible to hear, and I (we) wish you the sincerest of apologies and hopeful thoughts. We'll miss you on the site, of course, but you're right to leave, because at this point, by her side is probably the best place you could be. I don't pretend to know much about this, but if there's anything we all can do to help or if you just want to talk, just say the word. This is the kind of unfair thing that should never happen, but when it does, we have to hang on to hope for as long as we can without hurting ourselves too irreversibly in the process. We're hoping for you guys too. Good luck and I wish you and your sister the best. <3