Are you asking about stimulus payments----EIP payments? Or are you asking about the advance monthly child tax credit payments?
What are the ages of your children?
If you did not get the 1st and/or 2nd stimulus amounts for both children then you can use the recovery rebate credit on your 2020 tax return to get it. Make sure that your children are entered as your dependents and that you entered their Social Security numbers. You must indicate that they lived with you for more than half the year in order to get the stimulus money or the CTC on a 2020 tax return.
The stimulus check is an advance on a credit you can receive on your 2020 tax return. If something went wrong or you did not get the stimulus check in 2020, you can get it when you file your 2020 return in early 2021
The Recovery Rebate Credit will be found in the FEDERAL REVIEW section. ( you should see "Let's make sure you got the right stimulus amount”) If you are eligible it will end up on line 30 of your 2020 Form 1040.
Make sure that you enter ALL of the stimulus money received for the 1st and 2nd stimulus for yourself, your spouse and your children.
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
The IRS is issuing 3rd stimulus checks on its own timetable.
You can use the IRS Get My Payment site to see what is expected for your 3rd stimulus check:
As for the monthly advance child tax credit payments: