The same thing happened to me about a year ago...some probably remember. My nephew stole my car, wrecked it (still driveable w/ the fan caught in the radiator), and brought it back.
I called the police and had fingerprints taken right away, but it turns out they weren't needed. My nephew told my mom he didn't do it and all, but when the police officer questioned him, he admitted to it. I agreed on $1500 in damages, which I have a written & signed contract saying he has to pay me back. He's about half way, and I'm not strictly enforcing the payment, but I'll get it all back.
I'd say call the police...your brother will **** if you do that. I would have called them right after you found out, but late may be better than never. If it overheated very bad, you may have to change the water pump gasket, possibly worse, but lets hope not. That's a very nice looking car
gray5.0beast: Kicking your brothers ass is one thing, but tearing your parents house up isn't cool