Lol! I'm really into Greek mythology too! Well, I don't think you're like Persephone at all. If you've read Percy Jackson & The Olympians A.K.A. PJO, you would understand why. (It's because in that series Persephone was kinda...stuck-up and rude to her stepson just because she was jealous of his mother.)
Not a problem. :)
I think it's definitely worth the effort to try and win your sister over because she [i]is[/i] family and you are stuck with her if you know what I mean. She's probably just worried about the things that you had mentioned in your journal but try and see what's wrong on her point of view. You never know until you try. :]
It's weird, because he's the same when we actually DO talk, but it's like... he's not as obsessive the rest of the time. Which I suppose is a good thing, because he's not blowing off the rest of his friends anymore, but it's still a bit of a shock.