Royal biographer Andrew Morton spoke with ET at Methodist Central Hall Westminster in England on Monday.
Princess Charlotte cries during her great-grandmother Queen Elizabeth's state funeral.
The funeral and its surrounding events included personal touches from the queen's closest family and friends.
The brothers shared a moment at the late monarch's committal service on Monday.
Prince Harry and Meghan Markle join Prince William and Kate Middleton at the late Queen Elizabeth II's Committal Service.
King Charles III along with his children, siblings and other family members, arrive at the late Queen Elizabeth II's Committal Service.
The couple tied the knot at St. George's Chapel at Windsor Castle in 2018.
The Duke and Duchess of Sussex and the Prince and Princess of Wales attended the queen's funeral.
Queen Elizabeth's coffin leaves Westminster Abbey in the royal procession.
Prince Harry did not wear his military uniform for his grandmother, Queen Elizabeth's, funeral service.
The Duke and Duchess of Sussex were seen with the Prince and Princess of Wales and their kids at the funeral of Queen Elizabeth II.
King Charles arrives at Westminster Abbey alongside his mother, Queen Elizabeth's, coffin.
Prince William, Kate Middleton, their kids, George and Charlotte, Prince Harry and Meghan Markle arrive at Queen Elizabeth's funeral.
The Duke of Sussex and the Prince of Wales previously participated in the processional from Buckingham Palace to Westminster Hall.
