Royal Family 'Shaking In Their Boots' Over Prince Harry Memoir, Royal Biographer Claims

Prince Harry's upcoming book, "Spare," is making it more difficult for King Charles III to mend the rift between his two sons, according to a royal biographer.

The royal family likely tried all they could to stop the Duke of Sussex's highly anticipated memoir from being released early next year, claimed Christopher Andersen, author of the new book "The King: The Life of Charles III." International Business Times could not independently verify this information.

"Oh my gosh, I think they're shaking in their boots over this," Andersen told Fox News Digital of the royal family's reaction to Prince Harry's tome. "I think that they've done everything they [could] to persuade Harry not to publish this book... I just think if you look at what happened in [Queen Elizabeth II's] funeral, I don't see fences being mended. I thought that Harry looked very unhappy. Of course, his grandmother just died. But beyond that, there were no affectionate moments. No one was singing 'Kumbaya' by any means."

Andersen said he spoke to numerous palace insiders and those who have known King Charles or worked with the 74-year-old monarch closely over the years for his new biography on Prince Harry's father.

According to the author, King Charles "still has affection" for his youngest son and is hopeful that Prince Harry and his older brother Prince William will reconcile. However, the upcoming memoir is reportedly making it challenging for the monarch to help his sons mend fences.

"I'm sure he wants to mend the rift between Harry and William," Andersen explained to the outlet. "How [is he] going to be able to do that with this book looming on the horizon with more revelations? ... It's gotta be adversely impossible, I think."

"I think that Charles is between a rock and a hard place here," he continued. "If Harry and Meghan [Markle] aren't going to be working royals, then he wants to follow his mother's dictum. And that is, if you're not full-time, you're out. But by the same token, he needs all hands on deck... It's going to be interesting to see what happens in the future."

Last month, Vanity Fair royal editor Katie Nicholl also said that King Charles was "devastated" by the fallout between the royals and his youngest child and wanted to fix their relationship.

"I think Charles has been devastated by how things have spiraled," the "New Royals: Queen Elizabeth's Legacy and the Future of the Crown" author previously told Fox News Digital. "And he is hopeful that there will be a reconciliation. I think we saw that in the very... public olive branches that were extended to Harry and Meghan. After the queen's death, particularly in that first speech that Charles gave to the nation, he spoke of his love for Harry and Meghan."

In his inaugural speech as monarch following the death of his mother Queen Elizabeth II on Sept. 8, King Charles sent Prince Harry and Markle his "love" as they "continue to build their lives overseas."

Nicholl suggested that the King addressing the Sussexes by their first names in his speech and allowing Prince Harry to wear his military uniform to a vigil for Queen Elizabeth are some signs that show the monarch wants to reconcile with his son.

Penguin Random House announced last month that Prince Harry's memoir, "Spare," will hit shelves on Jan. 10.

The book will feature "raw, unflinching honesty" and will be filled with "insight, revelation, self-examination and hard-won wisdom about the eternal power of love over grief," according to the publisher.