Prince Harry wrote his memoir for himself as he "could not keep trying to make his family happy", a source claims.
The Duke of Sussex's bombshell book, Spare, will be published on January 10.
Publication of the title was delayed after the death of the Queen.
Sources previously said parts of the book would be "revised" in the aftermath of the monarch's death.
However, sources familiar with the manuscript claim it is not a "takedown of his family".
Instead it is said to be an honest tale about his journey through life and supposedly a "beautiful read".
The book will detail family tensions that many readers will be able to relate to, The Telegraph reports.
It is understood that the rift between Harry and his family is now so deep that there is no hope of them reuniting.
One source told The Telegraph: "You can't kind of always live your life trying to make your family or your siblings happy.
“You have to choose your own happiness."
The process of writing Spare - a reference to Harry being King Charles' second son - was reportedly cathartic for the Duke of Sussex.
Sources claim the book will not rock the royal family in the same way as Harry and Meghan's bombshell interview with Oprah Winfrey.
The memoir is expected to explore the "genetic pain and suffering" that Harry has spoken about in previous interviews.
Harry will rake in more than £36million for lifting the lid on his time as a royal.
The 416-page memoir, ghost written by American novelist J.R. Moehringer and complete with a striking cover image of Harry, will contain “raw, unflinching honesty”, according to the publishers.
It will cost £28 for a hardback, with the audio book, voiced by Harry himself, priced at £20, but is already being offered at half the cost by Waterstones.
The book was set to come out this autumn but the date was pushed back as a mark of respect following the death of the Queen.
Sources with knowledge of the deal said both Harry, 38, and the publishers were keen to make changes to the memoir following the Queen ’s death.
One source previously predicted that the book would be "nuclear".
They added: “The very title demonstrates yet another confrontational attack on the family after claiming a desire for privacy.
“Palace lawyers will undoubtedly be on standby in the New Year waiting to see what is in it.
“If Harry’s previous allegations across numerous TV interviews are anything to go by, this will be nuclear.
"Regardless of the content, which will no doubt be explosive, there will be little chance of this acting as a vehicle to reconciliation for Harry and Meghan.”
