King Charles might’ve begun his reign with Prince Andrew and Prince Harry on the outs of the royal family, but his sister, Princess Anne, continues to be one of the few people His Majesty can depend on. BBC’s Boxing Day explored the unique bond between the Princess Royal and her eldest sibling, Charles. Anne described the king as “an actor who comes off stage having done a performance that they really put a lot into. It’s that kind of relief.” Due to their close relationship, the Princess Royal was branded as His Majesty’s “right-hand woman.” Although Andrew continues to attend royal gathering…