"I don't know what the law says in your area, but my understanding is that (in many areas) where there are two married parents who agree on no contact, grandparents do not tend to succeed in getting visitation. The law wasn't designed for them. GPR was originally designed for children, with an existing relationship with grandparents, who were denied visitation after divorce or the death of their child."
Exactly and like anything else, abusers when cut off will try to manipulate the system by saying the children are losing out on a "loving relationship" with them even if it is against the parents wishes. Any GP who is going to court where both parents are in agreement with the No Contact is immediately suspect to me because a court proceeding does cause harm to minor children.
So for all those say, it's "not all EGP's" that are using the system to manipulate and bully, I know but if your married adult children have walked away and stayed away, then regardless of previous relationship, IF you want to run to court under the guise of it being in the "best interests of the children", then I'm going to assume you are one of the parent's that is trying to abuse the system.
And regardless of 'success rate' -- the children are the most negatively impacted in even the most civil of court case. So, if AC think/believe their 'parent' may try, that is more then enough justification to never allow the grand-parents to meet the children.
At this point some EGP's will say, "But if the AC would just allow the contact then there would be no need to go to court." My counter to that is, "If you have to go to court to force a relationship you are not taking 'No' from the parents as their decision. People who don't accept 'no'/respect the choices of other adults are usually the issue."