A new book about Prince Philip, the Duke of Edinburgh, apparently reveals his real sentiments about his grandson Prince Harry's exit from the royal family. 

The book, titled Prince Philip Revealed, is from long-time royal commentator Ingrid Seward, and touches on the years of service of the Queen's husband. A section of the biography, however, focuses on Harry's decision to depart the UK and live in America with Meghan Markle, the Duchess of Sussex.

According to Seward, Prince Philip thinks his grandson "abdicated his responsibilities" to the Crown so that he could have a "life of self-centred celebrity." The 99-year-old royal is apparently disappointed that younger members of the royal family do not share the values that he and Queen Elizabeth hold. 

The book outlines how Prince Philip is struggling to understand how Prince Harry could give up his life in Britain when he had a unique opportunity to impact the world as a royal family member. Seward stated that Harry's decision reminded the Duke of Edinburgh of the Queen's uncle, King Edward VIII, who decided to give up the throne in favor of marrying the American divorcee Wallis Simpson. 

Prince Philip Revealed also underscores the royal's opinion about his son, Prince Andrew, who is embroiled in a legal controversy for his friendships with accused sex traffickers Jeffrey Epstein and Ghislaine Maxwell. The book claims that Prince Philip and Queen Elizabeth regard the Duke of York's failure of judgment in people as a "tragedy."

Prince Andrew has yet to talk to the FBI and the U.S. Department of Justice about what he knows of Epstein and Maxwell's operation. He also has to clarify why a woman has accused him of being intimate with her when he knew she was a minor. Prince Andrew publicly declared in a BBC interview that he does not recall ever meeting this woman, Virginia Giuffre.

Seward's book also tackled the letters Prince Philip wrote to Princess Diana during her marital problems with Prince Charles in the early 1990s. Apparently, the messages the Duke of Edinburgh sent to the princess were "too much," and she told her sons, William and Harry, not to be like their grandfather. 

The biographer said that the Princess of Wales "hated" her father-in-law. She allegedly told William and Harry to never shout at people or follow in the way Prince Philip treated those below him. 

Seward's book will be out in stores on Oct. 1.