You might have answered something incorrectly in My Info. Try deleting him and re-enter his information. If his only income was SS and you paid for over half his support, you should be able to claim him 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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