I'd only add to the above the degree courses offered by several Universities that offer an aviation qualification along with a CPL. I used to teach the 'ab initio' end of this to first year undergrads at BNU in High Wycombe, mostly very keen types with whom it was a pleasure to work. Although the course is 'modular' it offers the benefits of a recognised academic qualification as well as pilot training in a more varied environment than the integrated course. If the OP's nephew is 17 than he might consider applying for this for next year. He'd finish aged 21 with a useful degree and a so-called 'frozen' ATPL.
There are other universities offering this sort of course.
TOO