The royals may block Prince Harry from visiting Kate due to fears of "private information ending up in a book", a royal commentator exclusively told GB News.
The Duke of Sussex could be visiting the UK in May, as a 10th-anniversary service is being held in St Paul's Cathedral for the Invictus Games.
Prince Harry, 39, founded the Games in 2014 to allow injured service men and women and veterans to compete in sporting events.
If Harry travels to the UK, it could be possible that his wife, Meghan Markle, 42, could accompany him.
Prince Harry and Princess Kate used to have a very close friendship
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Some commentators have questioned whether Prince Harry will visit the Princess of Wales during his potential visit to the UK.
Kate, who is currently undergoing treatment for cancer, had a very close friendship with the Duke of Sussex before his departure to the US.
Royal author Gareth Russell spoke exclusively to GB News to explain whether or not Harry is likely to visit his sister-in-law.
He said: "It's hard to say what the Duke of Sussex will do.
Prince Harry's memoir spare was released in January 2023
Getty"There's quite a bit of scepticism within the Palace, certainly within many members of the British public, about his discretion and whether or not something will end up in another book or another interview.
"Also, whether more private moments like the conversations he had with his brother and father in the minutes after his grandfather's funeral will end up being publicly shared again.
"So it would be dependent on Kensington Palace and the Prince and Princess of Wales if they want that to happen."
In January 2023, the Duke of Sussex released his memoir Spare, where he detailed his royal feud with Prince William and Kate.
Prince Harry wrote about Princess Kate in SpareGettyLATEST ROYAL NEWS:
Harry could return to London in May 2023 for an Invictus Games event
GettyRussell continued: "Obviously, some quite unkind and very unflattering things were said about the Princess of Wales in Spare.
"So whilst of course an illness absolutely can make us rethink our priorities, it has to be keen on both sides wanting that kind of reconciliation and who knows that it could happen.
"Stranger things will happen at sea as they say.
"If this is someone trying to prioritise privacy during their very difficult medical treatment, that could be something that Kensington Palace are dubious about, but we'll see."