The Prince and Princess of Wales have now arrived in Sandringham for a Christmas holiday with their fellow senior royals after what has proven to be a particularly difficult year for the family. They will, of course, be joined by children Prince George , 11, Princess Charlotte, nine, and Prince Louis, six, who, earlier this year, had to process the news of their mother's cancer diagnosis. Back in March, mum-of-three Kate addressed the nation in a poignant video message as she announced she was