Two people cannot claim the same dependent. When your brother filed to claim the Stimulus payments using the Recovery Rebate Credit, he should have said he cannot claim himself as a dependent. Then he would have filed just to get the Stimulus. However, it sounds like he did not file that way. So two people cannot use the same social security number to claim the same dependent.
Now he can amend his return to say he cannot claim himself as a dependent then you will be allowed to carry him as a dependent. However, that will take quite a while to dlear up at the IRS.
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