Build the fence!!!!!

Kids are so horrible sometimes!
Have you ever sprung them? Like if they're being nasty have you ever just said something like "you're not being nasty, are you? She is alot younger than you" (a bit of a death stare wouldn't go astray here! Hehe) I find when older kids are sprung they tend to get a little scared of what will happen if they continue.. You might tell their mum or, heck, beat them up for all they know! So that has always worked for us. If they think they can get away with it they'll do it... But if they know you are aware of it they might just stop (fingers crossed!).

Poor, sweet bubba... I'd build the fence!
Hope you sort something out soon xxxx