Figured. Okay, you've replaced someone, your ID will be in your wallet (or purse, if you're into that sort of thing), and it'll usually have your current address. You'll usually have a job, so you'll probably want to give them your two weeks notice or call in dead as soon as you figure out what that is. There's portkeys, if you feel like poofing isn't your style. [Here's the list.] We're stuck here, sorry.
Oh, and your little brother's a moron, but I think you knew that one.