Question: David Frederick Wallace was the brother of a First Lady who was married to which President?

Related documents: [0]  [DOC] David Frederick "Fred" Wallace (January 7, 1900 – September 30, 1957) was an architect and brother of First Lady of the United States Bess Truman. [END] 
[1]  [DOC] Elizabeth Virginia "Bess" Truman (born Wallace; February 13, 1885 – October 18, 1982) was the wife of U.S. President Harry S. Truman and First Lady of the United States from 1945 to 1953. [END]  
Answer: Harry S. Truman
Harry S. Truman