Reports from sources close to the British royal family say that King Charles has not been taking his son Harry's calls since Harry published a memoir, "Spare," in 2023 that made Queen Consort Camilla Parker Bowles into a villainess.
"When Harry branded his stepmother Camilla a ‘villain’ in his book and revealed that both he and William initially begged their father not to marry her, Harry committed what Charles regards as a cardinal sin," Christopher Andersen, author of "The King," told Fox News Digital.
"No one disses Camilla in royal circles and gets away with it – not even a son of the king," Andersen said.
People magazine also reported that King Charles, who is battling an unknown form of cancer, has refused to talk to his son, who earlier renounced his royal title and moved to the United States with his wife Meghan Markle.
The pair are still called the Duke and Duchess of Sussex, but not Prince Harry and Princess Meghan, by their own choice.
People said that King Charles and Harry had a meeting in February that seemed positive, but that Harry is being told the King is "unavailable" now when he calls.
Harry's letters to his father have also gone unanswered.
King Charles does not carry a cell phone, so it's hard to know whether the calls are being intercepted unbeknownst to him.
It's possible his staff are trying to protect the King from the drama that often accompanies Harry and Meghan at a time when his health is more delicate than it has been.
Sources have also said that Harry's brother William, next in line for the throne, has taken sides with his father, making any hope for reconciliation slim.
Harry has made the issue about the lack of security provided by the Crown after he stepped down as prince, saying he wrote the book to make money for his own security detail.
Harry obviously has no love lost for his stepmother, who his beloved mother Princess Diana described as a "third person" in her marriage to then-Prince Charles.
The two carried on a long-term affair while he was married to Princess Diana, and he married Camilla a few years after she tragically died in a car accident.
But it's one thing to privately carry animosity toward a family member, however unwanted, and quite another to air one's dirty laundry for all to see like Harry did in the book.