Ronald Ferguson Ronald Ferguson Major Ronald Ivor Ferguson (10 October 1931 – 16 March 2003) was the father of Sarah, Duchess of York, former wife to the Duke of York. He was the maternal grandfather of Princesses Beatrice and Eugenie of York. Major Ferguson was polo manager, initially to the Duke of Edinburgh and later, for many years, to the Prince of Wales. Ferguson was the son of Colonel Andrew Henry Ferguson (1899–1966) and his wife Marian Louisa Montagu Douglas Scott (1908–1996), a first cousin of Lady Alice Montagu Douglas Scott, who became (after her wedding to Prince Henry, Duke of Gloucester)
Sarah Churchill, Duchess of Marlborough offer financially, as his estates were deeply in debt. Sarah had a rival for Churchill in Catherine Sedley, a wealthy mistress of James II and the choice of Churchill's father, Sir Winston Churchill, who was anxious to restore the family's fortune. John may have hoped to take Sarah as a mistress in place of the Duchess of Cleveland, who had recently departed for France, but surviving letters from Sarah to John show her unwillingness to assume that role. In 1677, Sarah's brother Ralph died, and she and her sister, Frances, became co-heirs of the Jennings estates in Hertfordshire and Kent.