Question: What is the date of death of Prince Christian Of Schaumburg-Lippe (1898–1974)'s mother?
Sentence (from "Prince Waldemar of Schaumburg-Lippe"): Prince Waldemar Stephen of Schaumburg- Lippe(" Waldemar Stephan Ferdinand Wolrad Friedrich Karl", b. 19 December 1940 in Glienicke) is a son of Prince Christian of Schaumburg- Lippe and Princess Feodora of Denmark, and the great- grandson of King Frederick VIII of Denmark.
Relevant evidence: No