Biography

Has Irish ancestry through her mother Catherine Guinness's side. She also has Norwegian ancestry through her mother's maternal grandmother Grethe Wulfsberg Wyndham.

Descent from the Guinness family through her mother's side. Her mother Catherine Guinness is the daughter of Jonathan Guinness, whose father was Bryan Guinness. Her mother Catherine's great-grandfather was Walter Guinness, 1st Baron Moyne, son of Edward Cecil Guinness, 1st Earl of Iveagh, and grandson of Benjamin Lee Guinness, who in turn was the grandson of Arthur Guinness, the founder of the Guinness brewery business.

Her great-grandmother was Diana Mosley, usually known as Diana Mitford, one of the Mitford sisters. She was first married to Bryan Guinness, and with whom she was part of the Bright young things social group of Bohemian young aristocrats and socialites in 1920s London. Her marriage ended in divorce as she was pursuing a relationship with Sir Oswald Mosley, 6th Baronet of Ancoats, leader of the British Union of Fascists. She married Mosley at the home of Joseph Goebbels in 1936, with Adolf Hitler as guest of honor.

Shares the same ancestor as Clara Paget through Marion Margaret Violet Manners, Duchess of Rutland (1856-1937), and Henry Manners, 8th Duke of Rutland (1852-1925). Clara is the great-granddaughter of their eldest daughter Lady Victoria Manners (who married into the Paget family), and Mary is the great-granddaughter of their daughter Lady Violet Catherine Manners (who married into the Charteris Family).