Have him buy a cheap manual car if "he" really wants to learn. That's what I did when I bought my first car. Nobody would teach me so I said F**k it, went to the dealership bought the car. Asked them to leave me and the car in an empty parking lot and spent about 2 hours practicing before I hit the road.
when I sold cars (Acura, of course), a woman was buying a used car...and the only one she liked that she could afford was manual, soooo.....I actually had to teach her how to drive manual right after she bought it...then she had to drive Dallas to Austin the very next day.