If he had less than $4700 of income not counting Social Security you can claim him as qualified relative and get the $500 credit for other dependents. If he had more than $4700 of income you cannot claim him.
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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