Kate Middleton Is Prince Harry's 'Second Great Loss' After Princess Diana: Royal Expert

Prince Harry wants to be close friends with his sister-in-law, Kate Middleton, again, according to a royal expert.

Tom Quinn, a royal biographer and author of "Kensington Palace: An Intimate Memoir from Queen Mary to Meghan Markle," recently spoke about Prince Harry and Meghan Markle's relationship with Middleton, who shared her cancer diagnosis last month. According to Quinn, the royal couple based in Montecito have different feelings about reconnecting with the Princess of Wales.

Quinn said Markle does not intend to reconcile with Prince William's wife despite the latter's condition unless she apologizes. Meanwhile, Prince Harry is allegedly "torn" between his wife and sister-in-law amid the ongoing family feud.

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"He really misses that warm, uncomplicated relationship, and he is torn between loyalty to his wife and regret about the loss of the woman he was so close to. Losing Kate was Harry's second great loss after losing his mother," Quinn told the Mirror.

Quinn earlier claimed that King Charles and Princess Diana's youngest son really wanted to mend fences with his family. However, he had a hard time convincing his wife as the former actress was still expecting an apology from the royals.

"Harry would love to patch things up with his sister-in-law and with his brother and father," Quinn previously said. "He sees things far more calmly now he has had his say in Spare and in various interviews, but he just cannot think how to do it and keep Meghan on board."

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Another royal expert, Ingrid Seward, editor of Majesty magazine, also spoke about the Waleses and Sussexes. According to her, Prince Harry enjoyed a great relationship with his big brother, Prince William, and sister-in-law, Middleton, for years before he dated and married Markle. When the former "Suits" star joined the picture, the chemistry allegedly changed.

"Kate, Harry and [Prince] William were a really close-knit trio. ... They all got on really well. And Harry was constantly around at Kensington Palace having supper with them, borrowing things from their fridge," the "My Mother and I" author said.

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"And then Meghan came into the mix, and it was disruptive. It wasn't like the other girlfriends. There [wasn't] that warm feeling. I think it started on the wrong foot."

It remains unclear when the Sussexes will reunite with the royal family. Prince Harry and Markle might travel to the United Kingdom for the 10th anniversary of the Invictus Games this year. However, Prince Harry's biographer, Angela Levin, said it would be difficult for the royals to meet with the "Spare" author.

"I don't think Harry's got anything to look forward to, really. If this happens in the UK, it's going to be very, very difficult for the Royal Family," Levin said on GB News.