The type of Social Security benefits being received have never made a difference---what matters is whether he had any OTHER income. If the person you want to claim as a dependent has less than $4400 of income not counting any Social Security and they lived with you for the WHOLE year, you may be able to claim them as a qualified relative and get the $500 credit for other dependents.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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