Franklin D. Roosevelt
26th President of the United States, Theodore Roosevelt
was the uncle of Eleanor Roosevelt
, who married Franklin D. Roosevelt
, the 32nd President. Nicholas Roosevelt, Teddy's great-great-great-great grandfather and Eleanor and FDR's great-great-great-great-great grandfather, assisted Robert Fulton in the development of the steamboat. FDR's grandmother, Mary Rebecca Aspinwall, was a first cousin of James Monroe's wife, Endicott Peabody.