Sumner married Grand Duke Vladimir Cyrilovitch Romanov in 1934. Vladimir (son of Grand Duke Cyril Vladimirovitch Romanov and Grand Duchess Victoria Melita of Edinburgh) was born on 30 Aug 1917 in Near Borga, Finland, Finland; died on 21 Apr 1992 in Miami, Miami-Dade County, Florida, United States; was buried in Saint Peter and Paul Fortress Mausoleum, Saint Petersburg, Saint Petersburg Federal City, Russia. [Group Sheet] [Family Chart]