DEREK. I don't think you really do but whatever, just don't be a dick and don't die. Hey man, don't worry about it. I'm glad that you've got your sister here though. I'm sorry she got dragged here, but at least you've got someone from your family around. And what drama, the sex thing? They'll get over it, the girl is a teenager, teenagers do stupid stuff all the time. It'll blow over.
Good luck with guardian duty, I can't say I envy you.