Antioch College President Roosevelt and former Ohio Governor Bob Taft are both the great-grandsons of American Presidents. Roosevelt's great grandfather was Theodore Roosevelt, President from 1901 to 1909. He was succeeded by William Howard Taft of Cincinnati.
The relationship between the two men is chronicled in The Bully Pulpit: Theodore Roosevelt, William Howard Taft and the Golden Age of Journalism, by Doris Kearns Goodwin, published in 2013. They two were allies; Taft served as Roosevelt’s Secretary of War, but later clashed and Roosevelt ran against Taft in 1912.