I have a lot of experience in this area...let me just say this:
He can make an EXTREMELY good living, if he learns from a craftsman how to do the detail work (showers, tub surrounds, patterns, backsplashes, etc.), in addition to the larger jobs. Guys who are very detail-oriented and meticulous are in such demand I cannot begin to explain it to you. It may take him a little while to get there, but once he gets that reputation he will end up training his own crews to keep up with the work.
Have your extended family let him “practice” in your homes...you could all end up with some great-looking bathrooms & kitchens...LOL!
He is learning on a ground floor room in my house and then moving to a counter in my kitchen. He is then going to work on a friend’s bathroom, and others are interested. I also have four apartments I want tiles, but later.
Thanks for the information. I think that this will be good for him.