I suppose we all arrive at parenting/grand parenting with different experiences and expectations of what those roles mean. I think most difficulties in relationships between those parties come from upset over unmet expectations. It is probably good to think about where the child in law has come from with their own experiences of those roles, not just how it was for our own children. I think grandmothers and grandfathers sometimes expect that their own GC will be as involved as their own parents were. New parents might expect similar, as far as their own experience with their grandparents. When that's very different, it can equal discontent and trouble if one side feels slighted by the differences.