Since you identified the person as a relative, he would not have to have been a member of the household all year (for tax purposes cousins don't count as relatives).
Assuming the relative does not qualify as a "Qualifying Child", the amount of support you provided would have to be more than the assistance, food stamps and support he got from others and himself.
See full dependent rules at <a rel="nofollow" target="_blank" href="
https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...>
