Question: When did Lady Dorothy Macmillan's mother die?
Sentence (from "Evelyn Cavendish, Duchess of Devonshire"): Evelyn Emily Mary Cavendish, Duchess of Devonshire, DStJ, (née Petty-FitzMaurice; 27 August 1870 – 2 April 1960) was the wife of The 9th Duke of Devonshire.
Relevant evidence: Yes