Will,
I personally wouldnt ask this type of advise on these forums, as coming here is enough to put anyone off a career in aviation. People seem to have a down atitude on things, dont know why. But in the real world (away from pprune) a pilot is still a great job.
If you meet the pilots themselves rather than on here, you'll probably get a more possitive answer. Go to the pilot shows or simply talk to the pilots when you see them on the airplane when you go on holiday.
Ive spent years, wanting to becoming a pilot, then I get put off by reading PPrune threads. But after meeting people and making friends that are pilots, its become apparent that what people say on here isnt that true, yes things have changed but they arnt as bad as people make out. A career as a pilot is still excellent, fun and well paid.
I know people who are pilots for BA, and some of the budget airlines, and not one of them regret doing what they do, they earn 3 - 5 times as much as me (im on £30k, not a pilot), and most of all, love what they do (i dont)
If you want your son to go into aviation as a pilot, then do so, its an excellent career, and I hope to go into it too.