Question: When did Prince Wilhelm Of Prussia (1783–1851)'s father die?
Sentence (from "Prince Frederick of Prussia (1911–1966)"): Prince Frederick of Prussia( 19 December 1911 – 20 April 1966), also known as" Mr. Friedrich von Preussen" in the United Kingdom, was the fourth son of Crown Prince Wilhelm of Germany and Duchess Cecilie of Mecklenburg- Schwerin.
Relevant evidence: No