Also, it's doubtful that he does not qualify as your dependent with only $10,000 of potential self support funds. You're missing out on the $500 "Other dependent credit".
Furthermore, even if he had to file (and he doesn't), with the tax law change, effective 2018, most dependents will have the same tax liability whether they claim themselves or not. The personal exemption has been eliminated and the standard deduction increased.
