She is not; however, she does portray the queen's sister in The Crown. That said, she has quite a family tree. On her father's side, her paternal great-grandfather was an Earl and the Prime Minister for Britain. She is also distantly related to the pioneering nurse Florence Nightingale. On her mother's side, her maternal grandfather was a Spanish Diplomat who saved thousands of Jewish citizens during World War II. Her maternal grandmother was a baroness from an upper-class jewish family, and she is distantly related to the Rothschild family. Add to that the fact that she was made a dame by the queen of England, and you have a pretty impressive lady.