View gallery Image Credit: Getty Images The Royal Family includes many known names and faces, as they are the most known public figures of the United Kingdom. During her long life, the late Queen Elizabeth II welcomed four children with her late husband, Prince Philip. Her eldest son, King Charles III, ascended to the throne on September 10, 2022, two days after his mother's death. King Charles III has three siblings. (Shutterstock) Below is a closer look at the king's three siblings, from oldest to youngest. Princess Anne, 75 King Charles III & Princess Anne in Jan. 2023.