Nonnie,
Why mediation doesn't work?
Whether the parents or the gp are the unreasonable ones - it doesn't matter in this case.
Before somebody decides to sue another, both parties have tried to talk, say no to the request and maybe explain reasons why it does work, maybe even compromise (you want 2x a week, I give you 1x visit a week, for example) but it is not accepted
When parents say no and grandparents refuse to accept the no and keep pushing for what they want, communication is already broken down to the point that the parents will dig their heels the more the gp push. It is psychology 101.
So when mediation is held, it is seen as grandparents trying to force the parent's hand using the law and again not respecting their no. As adults, it does not sit well on the parents.
So no, mediation may not work at all, even if the mediator thinks gp were an important part of the gc's live.
Mediator is only an intermediary dealing with a hostile situation, no a magician that solves a conflict that has been going on for a long time