forget what occurred in the past..... on the 2020 tax return there is a 'settle up' section for the stimulus. It is ALL based on your 2020 income and filing status, including what qualified children are listed. TT will calculate how much you are eligible for (let's say $1700+1200 from your post) and SUBTRACT what YOU actually received. If that answer is positive, the credit will appear on LINE 30 of FORM 1040 and will increase your refund. if that answer is negative, you do not owe it back to the IRS.
There is a quirk in the stimulus rules where if one spouse claimed the child in 2019 and received the PAYMENT for that child, but the other spouse claimed the child in 2020, then it is quite possible that the IRS ends up giving money to both parents for the same child! which looks like this case here.
ps TT has not programed in the logic for the 2nd stimulus yet, but it's expected to be there by the end of January when the filing window opens...
does that help?
