My mom filed my kids on her taxes for 2020 and she got the stimulus money for them too (She gave me half.) (We all live with her and she paid for things they needed so yes it was legal for her to claim them) (I didn’t work)

I filed my 2020 taxes and I got a stimulus payment or two from doing so but of course I didn’t claim the kids because she already did. We were wondering if there’s a way for her to opt out of receiving the child tax credit and for me to add them onto mine so that I get the money for them. She isn’t going to be filing taxes next year because she hasnt been working this year and neither have I. Is this possible? Any advice?