[waitinginnj]

If talking hasn't helped, I would write your thoughts in a letter. It will demonstrate how much you believe in what you are saying and give you the opportunity to express:
how thrilled you are that your children are loved [list][*]that this transition process won't last forever[*]that you will find so much joy when you can see your[*]children interact with their grandparents in the future, when it is the right time and healthy
for them.[list]

Sometimes the written word is much more influential that the spoken word, esepcially when it is an emotional time for either party.

If they can't respect your thoughts after that, it becomes their problem and you have to let it go.

Good luck.