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You dug up old information.   The amount is now $4700 of income.  (not $4300)    That refers to any income OTHER than Social Security income.   So....as stated to you, the few dollars of interest do not exceed $4700, and does not interfere with the adult child claiming them.  These  "elderly" people are not required to file a tax return.   The parents did not have enough income to be required to file a tax return.  Not a joint return.  Not separate returns.   

 

The adult child who claims them gets a $500 credit for other dependents on their own return, which reduces their own tax liability.   

 

This  is what the adult child gets:

 

https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...

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