Grandparents rights are a tricky subject in Oklahoma.  Depending on the particular facts of your case, grandparents may be granted visitation with their grandchildren, they may serve as foster parents for their grandchildren, they may seek guardianship of their grandchildren, or they may seek to become the adoptive parents of their grandchildren.
There are times when grandparent visitation may be ordered.  In order for a grandparent to be awarded visitation, it must be in the best interest of the child, the parents are unfit or the child will suffer harm without the granting of grandparent visitation rights, and the grandchild's family has been disrupted by divorce, separation, desertion, death, or incarceration of the parents.