If your money went to a closed account they will eventually mail you a check. Or if they do not do that then you use the recovery rebate credit on your 2020 tax return. The stimulus money was an advance on a credit you get on the 2020 return. If you did not receive any of it, you can get it ALL as part of your 2020 tax refund. Your part and the children's part.
And you did not have to work in order to claim it. You are confused and I worry that you are about to make a an expensive mistake if you agree to let your BF claim your children.
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...
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, If you are eligible it will end up on line 30 of your 2020 Form 1040.
https://www.irs.gov/coronavirus/coronavirus-tax-relief-and-economic-impact-payments-for-individuals-...
https://ttlc.intuit.com/community/tax-topics/help/how-will-the-stimulus-package-impact-me/00/1393859
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
