Royal expert Katie Nicholl has revealed that King Charles' wife of 17 years - Queen Consort Camilla - has been a “hugely positive influence” on the King, 73, in encouraging him to get closer to his grandchildren.The royal author tells OK! that we saw a "hands-on" side of Charles, 73, during June - when the nation celebrated the Queen's Platinum Jubilee. She revealed four year old Prince Louis asked to sit on “Grandpa’s knee”. She added that Prince William and Kate Middleton's children - Prince George, Princess Charlotte and Prince Louis - often play hide and seek in and around his favourite bothy never Birkhall - his and 75 year old Camilla's home on the Balmoral estate.