@mel6502 You stated earlier you received a letter 6475 reporting $2800 for you and your spouse. You should enter at least that amount for third round stimulus payments already received. If you know you also already received an additional $2800 for your dependents but just haven't gotten a letter showing that, you should still enter that amount as received as well.
If you did not receive the other $2800 then don't enter that amount.
As @kemo1a states the $2400 is likely round two stimulus payments and does not go in your 2021 return.
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