The elder sister of David Bowes-Lyon married a prince who was the last Emperor of what country?
George VI George VI (Albert Frederick Arthur George; 14 December 1895 – 6 February 1952) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death. He was the last Emperor of India and the first Head of the Commonwealth.
Archduke Eugen of Austria Archduke Eugen Ferdinand Pius Bernhard Felix Maria of Austria-Teschen (21 May 1863 – 30 December 1954) was an Archduke of Austria and a Prince of Hungary and Bohemia. He was the last Grand Master of the Teutonic Knights from the Habsburg dynasty.