Camilla burst in tears a William and Kate plan to expose her secret involvement in the Diana’s accid.

Prince William and Queen Camilla have put on a united front to support King Charles, who is battling cancer, but things weren’t always so cordial between them.

Royal expert Hilary Fordwich claimed to Fox News Digital that, at first, the heir to the British throne had no love for his stepmother after witnessing the messy, public breakdown of his parents’ marriage.

“Prince William initially couldn’t stand Camilla,” Fordwich told Fox News Digital. “[But] he has come to appreciate her steadfast dedication to duty. They have become closer and have bonded over their spouses coping with cancer treatment.”

“Camilla has a calming influence on King Charles. Prince William appreciates that she also makes his father happy,” Fordwich added.

Fordwich’s claims came shortly after it was revealed Camilla isn’t afraid to put William in check whenever she feels he’s being disrespectful to his father.

Robert Jobson, author of the new biography “Catherine, Princess of Wales,” recalled one incident when William and wife Kate Middleton asked to join Charles and Camilla’s security convoy leaving Windsor Castle. In an excerpt published by the U.K.’s Mirror, the royal correspondent claimed that the younger royals kept the older couple waiting, to Camilla’s dismay.

Author Robert Jobson claimed the Prince and Princess of Wales kept the king waiting to Queen Camilla’s dismay. (Lesley Martin/Pool/Getty Images)

Jobson wrote that Camilla told Charles to leave the pair behind to prove a point to William.

“When Charles was kept waiting several minutes for the couple, Camilla insisted they go without them,” Jobson wrote. “As William and Catherine emerged, all they could see were the blue flashing lights of the motorbikes disappearing in the distance.”

The book noted that Camilla would often give William “subtle” reminders of the hierarchy.

According to reports, Queen Camilla is protective of King Charles, her longtime love. (Peter Macdiarmid/Getty Images)

A spokesperson for Buckingham Palace told Fox News Digital the palace had no comment about Jobson’s book. A spokesperson for Kensington Palace, which handles the offices of William and Kate, didn’t immediately respond to Fox News Digital’s request for comment.

Christopher Andersen, author of “The King,” told Fox News Digital it took some time for Camilla to build the courage to stand up against her stepson.

Queen Camilla and Prince William have a warm relationship today, but it hasn’t always been this way, royal experts claimed. (Henry Nicholls/WPA Pool/Getty Images)

“Camilla was so terrified at the prospect of meeting William that when she finally met him at Clarence House, she was trembling like a leaf and needed a vodka and tonic afterward,” Andersen claimed. “That seems perfectly understandable since Camilla — and the world — knew she had destroyed the marriage of William’s parents, Charles and Diana.”

Whatever true feelings William might have had for Camilla, he kept a poker face, Andersen claimed.