Question: When did Flemming Topsøe's father die?
Sentence (from "Haldor Topsøe (1913–2013)"): Haldor Frederik Axel Topsøe (24 May 1913 – 20 May 2013) was a Danish engineer and founder and Chairman of the catalysis company "Haldor Topsøe".
Relevant evidence: Yes