It all depends on the question if he takes a fee for managing the funds or not. If he gets paid, there is no way around a licenseThat's not true at all. With family, probably the easiest way is to set up an LLC and you can do it very cheaply in quite a few countries. Electronic filing and you won't even need an accountant.
You can also do a loan agreement as @apo99 mentioned, as you're not managing money but took a personal loan, you're not qualified as a professional.
