Britain's beloved royal family has been spreading holiday cheer over the years through their festive season's greetings cards. Prince William and Duchess Kate often used the special occasion to document their growing family after their 2011 nuptials. The pair, who share Prince George, Princess Charlotte and Prince Louis, showed how much their children have grown in their festive 2021 photo, writing via Instagram, "Delighted to share a new image of the family, which features on this year's Christmas card.