Hello - the USA remains a good place to do basic flying instruction. The costs are as low as they can be, and the number of small airports is huge.
Honestly, I cannot think of a specific school to recommend. The best way to do it is to get online and look for reviews and experiences of those who have done the courses. I'd recommend a school in the desert Southwest, because the weather is superb, and the cost of living is low. Florida is another State with a large number of good schools, although the weather can e a bit more aggressive. That's a good thing, because a pilot needs to work with weather on a daily basis.
Look for a school that offers room and board - that keeps it simple. The biggest thing, though, look for good reviews.
Best of luck to your brother in a very exciting career. But be aware that the career of a professional pilot has changed for the worse in the last 20 years. It's not what it used to be. But it is still an excellent job.