PRINCE William’s relationship with his brother is “hanging by a thread” ahead of of the release of Harry’s bombshell book, an insider has claimed.
The Duke of Sussexes' tell-all memoir 'Spare' will hit the shelves on January 10.
Harry has promised to examine the “highs and lows” of his extraordinary life as royal, which culminated in his bitter “Megxit” split from the Royal Family.
And now publishing sources say it will further damage the relationship between Harry and William.
One source told The Daily Mail: “'Things are hanging by a thread as it is after the past few months, and from the sounds of it Harry's memoir is unlikely to help.”
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It comes after The Sun told Harry’s new book will blast the system that left him playing “spare” to his older brother.
A source said: “At the heart of this book lies a sibling rivalry between little brother and big brother.
"It will reveal Harry’s bitterness and feelings of unfairness that by the nature of hierarchy and birthright that he always played second fiddle to older William.”
The highly-anticipated book is ghostwritten by JR Moehringer, a Pulitzer prize winning journalist, who previously ghosted tennis player Andre Agassi’s autobiography.
It's thought the memoir will answer questions which were not broached in Harry and Meghan's Netflix show.
Experts believe dramatic moments were held back from the show as content for the book.
Meanwhile it's thought that Meghan is also thinking about writing her own tell-all.
A source close to the couple told OK she “is contemplating getting entirely candid about her time in the royal limelight, considering crafting a memoir of her own,”.
They added: “She fully intends to write this book and leave no stone unturned.”
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Harry is understood to have already recorded a TV interview about the book with ITV News at Ten’s Tom Bradby.
It is expected to air on Sunday — two days before the book is published.