One of the most difficult things about losing a person suddenly is the loss of what could have been. It’s something that Princess Diana’s sons, Prince William and Prince Harry, have surely given a bit of thought to.
Diana didn’t get to see her boys grow up. She didn’t get to form a relationship with them as adults. She couldn’t proudly boast about their accomplishments in the military. Their wives would never get the chance to bond with their iconic mother-in-law. Of course, their children would never get to know her, either.
Both William and Harry have made some mentions of what they imagine Diana would be like today. Some of that speculation involves what kind of a grandma she would be to her four grandchildren. It’s a bittersweet thought, but it’s very likely she would have relationships with each of them as unique as the little ones themselves.
Source : https://www.littlethings.com/princess-diana-grandmother/