Meghan Markle, Prince Harry, Prince William, Kate Middleton on the balcony of Buckingham Palace in London on July 10, 2018

Meghan MarkleandPrince Harryare in the dark aboutKate Middleton’sabdominal surgeryand recovery.

“They are aware of everything that goes on back in England, but are being left out of any details regarding Kate,” a family source tells PEOPLE. “There is clearly no trust.”

Despite Prince Harry, 39,traveling from California to the U.K. last monthfollowing the announcement ofKing Charles’cancer diagnosis, his brief visit to his home country did not involve meeting with his brother,Prince William, 41, or sister-in-law, Princess Kate, 42. A royal source said at the time there were"no plans" for the brothers to get together.

A former courtier suggested that the Prince of Wales' “principal concern is his wife” in the weeks following the surgery that kept her in the hospital for nearly two weeks, but trust continues to be a concern following the release of Harry’s revealing memoir,Spare,and theNetflix docuserieswith Meghan, 42.

“It would be the normal run of things to go and see your sister-in-law who’s had a serious operation and also see your niece and nephews. But it isn’t normal. It’s terribly sad,” asource close to the royal household told PEOPLE.

Prince William and Prince Harry unveil a statue of their mother, Princess Diana, at Kensington Palace on July 1, 2021.YUI MOK/POOL/AFP via Getty Images

Prince William, Duke of Cambridge (L) and Britain’s Prince Harry, Duke of Sussex chat ahead of the unveiling of a statue of their mother, Princess Diana

In another sign of the ongoing family rift,Queen Camillamade a deliberate effort to be in the room during Prince Harry and King Charles' 30-minute reunion on Feb. 6.

“This is all to do with William’s wish to protect the institution of the monarchy, which he feels Harry can’t be trusted with. I don’t think William will ever agree to readmission of Harry into the family unless he clearly apologizes and moves forward,” royal author Robert Lacey told PEOPLE.

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Kate Middleton, Prince William, Prince Harry and Meghan Markle view tributes to Queen Elizabeth on Sept. 10, 2022.Chris Jackson/Getty

Catherine, Princess of Wales, Prince William, Prince of Wales, Prince Harry, Duke of Sussex, and Meghan, Duchess of Sussex on the long Walk at Windsor Castle arrive to view flowers and tributes to HM Queen Elizabeth on September 10, 2022

Chris Jackson/Getty

Prince Harryspoke withGood Morning America’s Will Reeve last month about thetrip to the U.K. to see his father.

“Look, I love my family. The fact that I was able to get on a plane and go and see him and spend any time with him, I’m grateful for that,” Harry said in the on-camera interview.

The Duke of Sussex added, “I have my own family, as we all do. My family and my life in California is as it is. I’ve got other trips planned that would take me through the U.K. or back to the U.K., so I’ll stop in and see my family as much as I can.”

King Charles and Prince Harry join a procession for Queen Elizabeth’s Lying-in-State on Sept. 14, 2022.Jeff J Mitchell - WPA Pool/Getty

Prince William, Prince of Wales, King Charles III and Prince Harry, Duke of Sussex walk behind the coffin during the procession for the Lying-in State of Queen Elizabeth II on September 14, 2022 in London, England.

Jeff J Mitchell - WPA Pool/Getty

With King Charles and Princess Kate’s health scares keeping them away from public duties,Meghan MarkleandPrince Harrywould be major figures in the royal family if they hadn’t stepped back from their roles in 2020 and relocated to California.

“This is a slimmed-down monarchy in the ways the King could never have anticipated. This puts into much sharper focus what a terrible mistake it was for Harry to leave,” royal biographer Sally Bedell Smith told PEOPLE. “If he and Meghan had stayed in Britain and stuck with their jobs, they could be very vital players right now.”

Added Catherine Mayer, the author ofCharles: The Heart of a King,“They desperately need him, and nobody could have foreseen the set of circumstances that would expose that so dramatically.”

source: people.com