Are you asking about the $500 credit for other dependents on your tax return, or are you asking about the $500 stimulus for a dependent child under the age of 17?
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
If your grandchildren are your dependents on your tax return and you did not receive the stimulus money for them, you can still get it on your 2020 tax return ---assuming they are under the age of 17 by the end of 2020.
**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.**
