Question: When did Sophie Lebrun's mother die?
Sentence (from "Sophie Lebrun"): She married Munich court piano maker J.L. Dülken in 1799 and had children Theobald (b. 1800), who married Louise David the famous pianist, Louise (b. 1805), Fanny (b. 1807) and Violande (b. 1810), all of whom became musicians.
Relevant evidence: No