Are there gparents rights in Ohio?

Please explain the situation--and parents or gparents?

Ohio has authorized grandparent companionship or visitation rights by statute
In three circumstances: (1) when married parents terminate their marriage
Or separate, (2) when a parent of a child is deceased, and (3) when the child
Is born to an unmarried woman. But you aren't guaranteed rights just because of any of those 3, and must petition the court to get a ruling in each case.