Question: When did Lord Herbert Montagu Douglas Scott's mother die?
Sentence (from "Walter Montagu Douglas Scott, 8th Duke of Buccleuch"): Walter John Montagu Douglas Scott, 8th Duke of Buccleuch and 10th Duke of Queensberry,( 30 December 1894 – 4 October 1973) was a Scottish peer and Conservative politician.
Relevant evidence: No