What rights can a Grand Parent get from Dieceased Son's Wife to their grand children

You may be able to get an order granting you a possession schedule for your grandchildren. You would have to show that denial of possession of or access to the child would significantly impair the child's physical health or emotional well-being. This is often proven by showing that you had a previous relationship with the children. Thus, denying them the relationship would significantly impair the children's physical health or emotional well-being. Did the children ever live with you? Did you see them regularly before your child died? These and many other questions would need to be explored. Also, the mom might agree to a schedule once you file suit.