Can grandparents get partial custody or visitation?

Grandparents are able to file a petition for partial custody or visitation. They may petition when a parent of the child has died, where the parents of the child have been separated for six months or more, or when divorce proceedings have commenced, or when the child has lived with the grandparents for 12 months or more and subsequently been removed from the home by his or her parents. Grandparents may also seek primary physical custody of the grandchild under very limited circumstances.