RE: Trainer??
just about any slow flying plane would work if you are the instructor. do you have a cub or a flat bottom wing plane in the hanger? if you do then just get a second radio for a buddy box. the only thing is it might take him longer to land, if its not a trike style landing gear. but then again, a 12 yr old that has been playing video games a little might be better than us seasoned guys