Prince George, Princess Charlotte and Prince Louis have a number of cousins that they are clearly very close with, as they've frequently been seen them playing and causing mischief together at important events.The late Queen had 13 great-grandchildren: Savannah Phillips and Isla Phillips; Prince George, Princess Charlotte and Prince Louis; Mia, Lena and Lucas Tindall; Prince Archie and Princess Lilibet; August and Ernest Brooksbank and Sienna Mapelli Mozzi. While Prince Harry's children, are the trio's only royal first cousins, there are several other younger members of the family who they undoubtedly enjoy hanging out with.