So sceered!

So I'm at the in-laws and my brother in-law is acting like a 5 yr old. He's 12. He was walking from the next door neighbors house to here and at some point his lense to his glasses fell out. So he comes in wakes up his mother and begins yelling at her to take him to wal-mart!! I'm just like "what?" he demands for her to take him to wal-mart right now!! She just begins to tell him that the eye place isn't even open right now. Duh! So he stands in the door way w/ the door wide open and basically does nothing! So I asked him to please shut the door. He throws another fit!! I'm really just at the point w/ this kid that I don't want the boys around him. If either one started to talk back to me like that I'd just slap the hell of them! OMG!! At what point do you go OK now where did I go wrong and what do I now? Who can help me at the point? Ahhhh....this kid just needs a good spanking! Scares me to think of the boys talking to me that way!! Where has the time gone? When I was a kid there was no way any of us would have gotten away w/ something like that!!