Question: During what war was the father of the Princess who was married to two men, one being a London based Dutch artist?
Sentence (from "Prince Christoph of Hesse"): Christoph Ernst August of Hesse (Frankfurt, 14 May 1901 – Apennine Mountains near Forlì, 7 October 1943) was the fifth son of Prince Frederick Charles of Hesse and Princess Margaret of Prussia.
Relevant evidence: Yes