Question: When did Prince Christian Oscar Of Hanover's mother die?
Sentence (from "Prince Ernst August of Hanover (born 1983)"): Ernst August, Hereditary Prince of Hanover( born 19 July 1983) is the eldest child of Ernst August, Prince of Hanover( head of the ancient House of Welf which once ruled the Kingdom of Hanover), and his former wife Chantal Hochuli.
Relevant evidence: No