Question: What is the date of death of Louis, Prince Of Hesse And By Rhine's mother?
Sentence (from "Louis, Prince of Hesse and by Rhine"): He married Margaret Campbell Geddes daughter of Auckland Campbell Geddes, 1st Baron Geddes in 1937, on the day after the Sabena OO-AUB Ostend crash, in which his mother, brother, sister-in-law, and nephews were all killed.
Relevant evidence: No