Question: What is the date of death of Prince Christian Of Schaumburg-Lippe (1898–1974)'s mother?
Sentence (from "Prince Christian of Schaumburg-Lippe (1898–1974)"): He was born in Sopron, Hungary, the only son and second child of Frederick of Schaumburg-Lippe (1868–1945) and his first wife Princess Louise of Denmark, younger sister of King Christian X of Denmark.
Relevant evidence: Yes