Both my sons grew up surrounded by guitars & banjos and have both evolved into fine musicians with a very wide taste in music. Both started out on acoustic instruments but went on to electric and back and forth ever since.
Fortunatley my wife is a good music teacher and I was able to pass on a few pointers as well.
The important thing is to encourage your son to enjoy whatever he decided to play. There are also a lot of very good books and CD's which may help. Your local music shop should have a list of local teacher.
Good luck hope he does well