Princess Diana's sister joined Prince William at an RAF passing out parade weeks after a Spencer family funeral, at which both he and Prince Harry were present.
Lady Sarah McCorquodale joined the Prince of Wales at the Royal Air Force College in Cranwell, England, on Thursday.
William conducted the Sovereign's Parade on behalf of King Charles III before giving a speech to graduates. There was a reception in the College Dining Room, where journalists spotted Lady Sarah.
Her support comes after Charles Spencer, Diana's brother, threw open his doors for Prince Harry to stay at the family estate, Althorp.
Prince Harry has made much of his feeling he is continuing Diana's legacy and frequently talks about his mother publicly.
William has been far less vocal about Diana, choosing to open up about her in 2017 on the 20th anniversary of her death in a series of interviews while at the same time telling journalists it would not happen again.
However, while William has said less publicly about their mother, he has always been on good terms with her family when they met, including with Sarah on Thursday.
Harry and William were also friendly with Diana's siblings during a July 2021 unveiling of a statue in her honor at Kensington Palace.
The two royal brothers were recently at a Spencer family funeral, that of Sir Robert Fellowes, the husband of Diana's sister, Lady Jane Fellowes.
Charles Spencer invited Harry to stay at Althorp before the memorial at St. Mary's Church in Snettisham, Norfolk. It was just a few days before the anniversary of Diana's death, meaning Harry was well placed to pay his respects to his mother at the same time.
Lady Sarah is an important figure in both Harry and William's lives and brought them back locks of Princess Diana's hair from Paris after she died in a car crash in 1997. In his book Spare, Harry said that he was convinced that his mother had not really passed away and was hiding somewhere.
He wrote: "She stepped forward, holding two tiny blue boxes. What's this? 'Open it.'
"I lifted off the top of my blue box. Inside was...a moth? No. A mustache? No. 'What's...?'
"'Her hair, Harry.' Aunt Sarah explained that, while in Paris, she'd clipped two locks from Mummy's head.
"So there it was. Proof. She's really gone. But then immediately came the reassuring doubt, the lifesaving uncertainty: 'No, this could be anybody's hair.' Mummy, her beautiful blond hair intact, was out there somewhere."
Jack Royston is Newsweek's chief royal correspondent, based in London. You can find him on Twitter at @jack_royston and read his stories on Newsweek's The Royals Facebook page.
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