Nomad pretty much hit this one on the head. Get one to pamper yourself, and have him try it. Play it by ear from there.
Also, if he CAN'T use your badger without irritation, try something like this
Synthetic brushes, shaving brushes, synthetic not made from badger hair UK
Amazon.com: Men-U Premier Synthetic Shaving Brush: Health & Personal Care
The Men-U gets GREAT reviews, it's very soft at the tip, but has a lot of backbone, but I've never had something from Taylor of Old Bond Street that I didn't like :)
Good luck!
Cheers,
Jeremy