Your Guide to Every Single Member of the British Royal Family

Lady Sarah Chatto is the daughter of the late Princess Margaret and niece to the queen. She is also the youngest grandchild of King George VI and Queen Elizabeth, the Queen Mother. Her family falls after her older brother, David, in line for succession. Lady Sarah is at the 21st spot, and her two sons, with husband Daniel Chatto, follow her. Their eldest, Samuel Chatto, is number 22, and their youngest, Arthur Chatto, is number 23.