LONDON, ENGLAND - DECEMBER 15:  Catherine, Duchess of Cambridge hugs a young boy in a santa hat as she attends the Anna Freud Centre Family School Christmas Party at Anna Freud Centre on December 15, 2015 in London, England.  The Duchess joined groups of families in Festive activities designed to help pupils reflect on the positive progress in their social relationships and communication skills.  (Photo by Chris Jackson - WPA Pool/Getty Images)