I've been to a couple classes (winter camping symposium) done by
Kelly. He has lot of stuff on youtube. Kelly learned under
Mors Kochanski. There are a few very good books put out by Mors Kochanski that don't cast all that much.
Bushcraft forum is also a good source of info.
Dave Canterbury also has a lot of Youtube info and books. He was also on Dual Survival for awhile, until it was discovered that the military experience he claimed to have was not what he actually had.. Due to that reason, he is the person who's name is not spoken on the web sight I linked above and why he was dropped from the show.
Winter Camping symposium is a yearly thing. A lot of good info to be had from good instructors with hands on, the cost is cheap too. Of course you also have vendors selling thier wares and its not hard to drop some $$$ for good kit. Their
Face Book Page.
Have fun, with your son.