You're one of a growing number of grandparents who are being denied access to their grandchildren because of a U.S. Supreme Court ruling just one year ago. Our noble justices don't appear to understand that all parents don't act in the best interest of their children and deny visitation with beloved grandparents without valid reason. The grandparents suffer because of this, but it's the children who are the real losers.
I grew up with one grandparent, my mother's father, and was so envious of friends with grandmothers. I've tried to be the best grandmother I can be, but you still have access to the children at the whim of the parent(s).
Since it's the mother denying you the children, is there any chance you could gain access to them through the father?