Should my brother qualify as a dependent if I paid for more than half of his living expenses and he didn't make more than the $5,000.00 income minimum?

My brother makes less than $5,000.00 a year and I pay for well over half of his living expenses but they say he doesn't qualify as a dependent because he 'supported himself'. Those were the questions it asked to determine eligibility and he should have qualified but doesn't. Can someone explain why?