My parents only wanted to see their oldest grandchildren (my nephew and niece) in order to leave them literature and try to talk to them about "the truth".
That isn't normal, and my sister & her husband stopped those visits a few years ago. Now they only get to see their grandchildren at funerals. It's strange for kids not to have grandparents, but they are growing up quite nicely without having people who share their DNA believe the main reason for a relationship is to "save" them.