Prince William and Prince Harry may be royalty, but their sibling bond is like that of any set of brothers. "Their relationship is incredibly intimate," Princess Diana's biographer Andrew Morton revealed in the November 2019 edition of Royals Monthly. "Nobody apart from each other knows exactly - not even their father - what's gone on in their heads and their hearts for the last 20-odd years. They both experienced the loss of their mother. The only people that they could trust to talk about it in a candid way was each of them.