Question: When was John Spencer-Churchill, 10Th Duke Of Marlborough's mother born?
Sentence (from "John Spencer-Churchill, 10th Duke of Marlborough"): John Albert William Spencer-Churchill, 10th Duke of Marlborough, DL (18 September 1897 – 11 March 1972), styled Marquess of Blandford until 1934, was a British military officer and peer.
Relevant evidence: No