Wanting to trade in my Dad's Grand Prix GTP

I'm Wanting to trade in my Dad's Grand Prix GTP, he is okay with it. However he is not available to do the trade in himself... Can i trade the car in for him, if he gives athorization??
cheers guys

you need to fedex him the title, have him sign it, and fedex it back.

title needs to be in your name, and registered to you i believe.