I am a single mother of two children and my mother relinquished her rights of me and my sister when I was 12. Now here is my question... my mother wants to go for grandparents vistitaion for my children and my sisters and she is willing to got to court for it. I was told by my CPS worker that she cannot do that because she legally has no rights. Is this true or am I being falsly advised?
I was never legally adopted but my sister was. So how would that affect her as well?

It might help to know your state
But I think since she relinquished her rights to you she wouldn't have any rights to her grandkids.

She has no legal rights to be your parent, and that extends to your children.