Lady Sarah Frances Elizabeth Chatto is a member of the British royal family. She is the only daughter of Princess Margaret, Countess of Snowdon, and Antony Armstrong-Jones, 1st Earl of Snowdon. She and her brother, David Armstrong-Jones, 2nd Earl of Snowdon, are the only maternal first cousins of King Charles III. At her birth, she was 7th in line to the British throne; as of 2026 she is 30th. Though she does not undertake public duties, she frequently attends events and ceremonies with the wider royal family.