LONDON, ENGLAND - DECEMBER 14:  Violet Webster, who has a hole in the heart and is aged 2,  helps Camilla, Duchess of Cornwall decorate the Clarence House Christmas Tree at Clarence House on December 14, 2016 in London, England. The Duchess of Cornwall, Patron, Helen & Douglas House invited children from the charity and children supported by Roald Dahl's Marvellous Children's Charity to decorate the Christmas tree and join Her Royal Highness for lunch at Clarence House.  (Photo by Chris Jackson - WPA Pool/Getty Images)