Bill, I can't speak for whether or not he would agree to mentor your nephew, but you might shoot terrykohler a PM and ask him. He's an instructor and a -9A builder based at Pontiac.
Canton- 1D2, has **** as of now they had some management issues, so unless you have your own plane not much to rent. Solo Aviation does have a plane or two there just no on-site presence.
He can get involved in EAA Chapt 113 at 1D2 very active club and very friendly. They have yearly scholarships and have mentored many 16-20's http://www.eaa113.org/