King Charles asked his sons not to make his “final years a misery” in a meeting with the siblings after Prince Philip's funeral, Prince Harry's book has reportedly revealed.
In an extract from Spare, the Duke of Sussex's autobiography which is released on Tuesday, Harry is said to have recalled the meeting in April 2021.
He describes the then Prince of Wales standing between the siblings, before telling them: “'Please boys, don't make my final years a misery.”
The extract was published in the Guardian, who “amid stringent pre-launch security around the book, obtained a copy”.
Harry also claims in the book that he was physically attacked by his brother after a row about his wife, Meghan Markle.
According to reports Harry claimed William had called the American actress “difficult”, “rude” and “abrasive” - comments which the younger brother said parroted “the press narrative” about his wife.
Harry adds that his brother had wanted to discuss “the whole rolling catastrophe” of their relationship but turned up to his then residence, Nottingham Cottage, “piping hot”.
As an argument between the pair escalated, Harry wrote: “(William) called me another name, then came at me. It all happened so fast.
“So very fast. He grabbed me by the collar, ripping my necklace, and he knocked me to the floor.”
The Duke of Sussex claimed a potential reunion with his relatives in the UK looked unlikely, with his father and brother having “absolutely no willingness to reconcile”.
Insiders fear that the Harry and William may “never reconcile” after Spare's release, with the book set to feature stinging attacks on him and his wife Kate.
A source told the Sunday Times: “Generally, I think the book [will be] worse for them than the Royal Family is expecting.
“Everything is laid bare. Charles comes out of it better than it had expected, but it's tough on William, in particular, and even Kate gets a bit of a broadside.”
It comes after the duke claimed in his Netflix documentary that William broke a promise not to leak stories or brief against one another.