Kate Middleton and Prince William delight fans. Like other couples in the royal family, they publish a Christmas card every year. This year, Middleton’s photo with her husband and children has left everyone astonished, according to the official Instagram account of the Prince and Princess of Wales. What’s special about the Christmas photo card In the photo, Middleton poses alongside her husband and children – 5-year-old Prince Louis, 8-year-old Princess Charlotte, and 11-year-old Prince George. The photo is not in color, which is a rare occurrence for portraits of members of the royal family. …