Last year when the original stimulus came out, the IRS didn't send the money for 2 of my children. Where do I put that in when I file for 2020?

[KathrynG3]

This will be included in the Recovery Rebate Credit section of your return.

To get to the section to report what has been received so far in each stimulus payment box, go to the search and enter stimulus. Click the Jump to link. 

For more details, see: How do I claim the Recovery Rebate Credit?