Yes, you would have to file an amended return for your son so he would be able to claim and get the exemption for himself. Before you do that, please double check the conditions that the IRS have below for another person to be able to claim their children, and if it matched what you have learned go ahead with the amend.
A parent may claim their child if they meet either the qualifying child or qualifying relative test as outlined below:
Qualifying Child
These 5 tests (all of them), will qualify a child as a dependent:
Qualifying Relative
These 4 tests (all of them) will qualify a relative as a dependent:
Here is the LINK that will help you get started with your son's amended tax return.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
Yes, you would have to file an amended return for your son so he would be able to claim and get the exemption for himself. Before you do that, please double check the conditions that the IRS have below for another person to be able to claim their children, and if it matched what you have learned go ahead with the amend.
A parent may claim their child if they meet either the qualifying child or qualifying relative test as outlined below:
Qualifying Child
These 5 tests (all of them), will qualify a child as a dependent:
Qualifying Relative
These 4 tests (all of them) will qualify a relative as a dependent:
Here is the LINK that will help you get started with your son's amended tax return.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed