Royal insiders fear that the book can target Prince Charles, Prince William, Duchess Camilla, and the institution itself.
Monday has been dubbed "freedom day" by the local media as most legal coronavirus restrictions in England have been lifted.
A source said that the Prince of Wales and his wife Duchess Camilla are "not very close" to Prince Edward and his wife Countess Sophie.
The heir apparent to the British throne inherited the title upon the death of his father Prince Philip on April 9.
The Queen has ramped up her public schedule in recent days and is always seen with a smile on her face.
The British monarch has put on a happy face in public since the Duke of Edinburgh died on April 9.
A network of "devoted friends and a few family members are working seriously" to broker peace between the warring brothers.
Royal experts believe Queen Elizabeth II is the one member of the royal family who can help her grandsons in resolving their differences.
Royal historian says "it was no accident" that other members of the royal family were also not publicly seen speaking with Harry on the day of the funeral."
When Diana confronted him about his affair with his now-wife Duchess Camilla, the future king's reaction was "to shrink back."
The Queen attended Trooping the Colour in a Lilac dress coat and hat decorated with yellow flowers that she had already worn twice.
Prince Philip felt that "the royal family has been turned into a soap opera and he regretted that very much."
Prince Edward said his "self-effacing" father "wouldn't have wanted the fuss and the bother" if he lived to see this day.
In a separate interview, Edward had said "Oprah who?" when asked if he has seen Harry and Meghan's tell-all.
The 95-year-old and other working royals will soon embark on a year-long nationwide tour to mark the occasion.
The 95-year-old can be seen in several other high-profile engagements over the coming weeks, including a meeting with US President Joe Biden.
The Duke and Duchess of Sussex learned of the Duke of Edinburgh's death an hour before palace announcement.
Prince Philip has also left possessions to his eight grandchildren, including Prince Harry, in the will which would have been "sorted out quite a while ago."
The Duchess of Cambridge has been described as the "glue" that will keep the royal family together.
The 95-year-old was also wearing a scarab brooch studded with small diamonds and carved rubies, that was gifted to her by the Duke of Edinburgh in 1996.
The announcement came on the third wedding anniversary of Harry and Meghan, for which the royal family didn't greet them on any social media platform.
The queen used to walk Fergus and two other dorgis around the grounds of Windsor Castle to keep herself occupied after Prince Philip's death.