David Frederick Wallace was the brother of a First Lady who was married to which President?
David Frederick Wallace: David Frederick "Fred" Wallace (January 7, 1900 – September 30, 1957) was an architect and brother of First Lady of the United States Bess Truman. Bess Truman: 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.
Harry S. Truman