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Britain's Prince Harry (R) and Rebecca (2R), the widow of murdered British soldier Lee Rigby, play with Rebecca's son Jack (2L) and George Hinchliffe, 3, (L) during a Special Garden Party at Buckingham Palace in central London on May 13, 2017. Their Royal Highnesses, Prince William, Prince Harry and Catherine, Duchess of Cambridge, hosted a special party in the grounds of Buckingham Palace to honour the children of those who have died serving in the Armed Forces. / AFP PHOTO / POOL / Andrew Parsons (Photo credit should read ANDREW PARSONS/AFP/Getty Images)

Britain's Prince Harry (R) and Rebecca (2R), the widow of murdered British soldier Lee Rigby, play with Rebecca's son Jack (2L) and George Hinchliffe, 3, (L) during a Special Garden Party at Buckingham Palace in central London on May 13, 2017. 
Their Royal Highnesses, Prince William, Prince Harry and Catherine, Duchess of Cambridge, hosted a special party in the grounds of Buckingham Palace to honour the children of those who have died serving in the Armed Forces.  / AFP PHOTO / POOL / Andrew Parsons        (Photo credit should read ANDREW PARSONS/AFP/Getty Images)