Wrong. It's called "guardianship".<quoted text>
And grandparents can become adoptive parents. I know a family in which the grandmother was awarded custody of her grandchildren. She was first given temporary custody and when her daughter didn't get her act together, she was awarded full custody.
Custody is a philosophy of law that arose out of children who were products of "divorce" or "common law" separation. It is between a childs parents. Bio. or adoptive.(Or the state, in loco parentis meaning ward of the state)
Grandparents can be awarded "temporary guardianship" then "guardianship" and if parental rights are terminated, they can petition to adopt.
AFTER ADOPTION, when the grandparents become legal parents, do they have what is considered "custody" with legally recognized "custodial rights".
But a grandparent CANNOT just march into court and "file for custody".
Trust me on this.