It is comforting to know that the courts now support the rights of grandparents to see their grandchildren, but the real question is when to use this, or even mention it as a bargaining tool.
In any family situation, the feelings are intense and relationships fragile. As people regress under stress, their is a tendency to blame ane even attack others to relieve the tension. Legal action is a line once crossed leaves little room for diplomacy. The line between love and hate can be thin. (think of divorces you have seen). Legal action to see a grandchild should be used only if all other avenues are exhausted and if the child is truly benefited. As distasteful as it might be, continuing to approach the estranged party with offers of helping them with the child is usually your best stategy. If this fails, the law is on your side.