Princess Diana‘s younger brother Charles Spencer is remembering his late sister 21 years after her death. In a new interview with People, the 54-year-old made a touching comment about the beauty. 

“One of the great tragedies is that Diana would have been the best grandmother ever,” he shared. Diana would have been a grandmother to three children: Prince George, 5, Princess Charlotte, 3, and Prince Louis, four months.

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While his sister was unfortunately killed in a car accident in 1997, he’s enjoying watching her legacy live out through her two sons, Prince William, 36, and Prince Harry, 33. “I love seeing the sort of uncomplicated way that they deal with people, and put them at their ease,” Charles told the news outlet. “It’s so easy to connect the dots between them and their mother.”

He continued, “I love the fact that there’s still such veneration inside her immediate family for what she was, and what she meant. I think that’s fantastic.”

It’s been 21 years since her tragic death and Charles still can’t believe how fast time is moving. “What’s amazing to me is the passing of time,” he said. “Now William and Catherine are nearly the same age as Diana when she died.”

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To keep her memory alive after all this time, Charles continues to remember his late sister. “One of the reasons I wanted to talk now is because I think after 20 years, someone shifts from being a contemporary person to a person of history actually,” he shared. “And Diana deserves a place in history.”

He concluded, “I think that it’s important for people who are under 35, who probably won’t remember her at all, to remember that this is a special person. Not just a beautiful one.”

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