Question: When did Prince Friedrich Sigismund Of Prussia (1891–1927)'s father die?
Sentence (from "Prince Friedrich Leopold of Prussia"): Friedrich Leopold Prinz von Preußen (14 November 1865 in Berlin – 13 September 1931 Krojanke manor, Landkreis Flatow, Posen-West Prussia) was a son of Prince Frederick Charles of Prussia and Princess Maria Anna of Anhalt-Dessau, married in 1854.
Relevant evidence: Yes