Q. Can you pay (all) someone’s bills and claim that money?
A. Simple answer: No.
But, as the other replies indicate, there are a few exceptions. So, it depends on the details. Paying someone's bills constitutes financial support. Support is one test (but not the only test) for claiming someone as a dependent, which might allow you a $500 other (other than a child) dependent tax credit.
See full dependent rules at: https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...
