If your son does not provide more than half of your financial support, please ask him to amend his tax return for 2019 to remove you as his dependent ask that he be sure not to list you on his 2020 tax return, so that you can file without issue next year.
Then, you will file a 2020 return in 2021, even though you are not normally required to do so.
At that time, you will be able to claim a refundable credit for the $1,200 that you should have received.
@Alanrw
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