You can amend past years to file jointly and most items will be accepted. However, stimulus payments will not be made based on having an ITIN.
if your kids were not previously on the tax return, you can add them when amended and credits will be issued as long as their social security numbers were issued before the due date of the return (including extensions). If they were already on the return, then the child tax credits won't likely change due to changing the filing status to married filing jointly.
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