Under the laws of many states in this coutnry there are statutes that allow grandparents reasonable visitation with their grandchildren if the parents do not agree to such on their own.In the situation that you have written about, the grandparents could still have permission to visit the grandchild in the event of an adoption if the parents allow such and possibly per the laws of your state. If the grandparents are good people, they should be allowed to visit the grandchild despite the fact that their son might give the child up for adoption.