The elder sister of David Bowes-Lyon married a prince who was the last Emperor of what country?
David Bowes-Lyon Sir David Bowes-Lyon KCVO (2 May 1902 – 13 September 1961) was the sixth son of Claude Bowes-Lyon, 14th Earl of Strathmore and Kinghorne, and Cecilia Nina Cavendish-Bentinck as well as their tenth and youngest child. His elder sister Lady Elizabeth Bowes-Lyon married Prince Albert, Duke of York, the second son of King George V, in 1923 and became Queen Consort of the United Kingdom after the abdication of her husband's elder brother Edward VIII on 11 December 1936.
Princess Laurentien of the Netherlands Princess Laurentien of the Netherlands (née "Petra Laurentien Brinkhorst"; born 25 May 1966) is the wife of Prince Constantijn and sister-in-law of King Willem-Alexander and Queen Máxima.