The one argument that really stung was with my mother-in-law. She's a former teacher, 30+ years. Lots of ugliness and tears shed between my wife and her.
My personal dislike of her aside, what kind of a grandparent DOESN'T want the very best for their grandkid? I've never even heard of such a thing.
People who would sacrifice their children on the altar of ideology are no better than pagans who sacrificed their children to a stone statue...............