sibling rivalry

I meant to add to my post last night that Esther asked me at lunch yesterday how to say "You're not my buddy!" in Chinese.  Oy.  I'm not thrilled that she remains determined on her course to be mean to her new brother, but the girl is smart!  Apparently all my explanations about how her brother will speak Chinese and not English have sunk in.  I told her that she can feel however she likes, but we don't allow our children to be hurtful to each other. It's going to be interesting figuring out how to enforce that rule!