The father of William Howard Taft (1857-1930), 27th President of
the United States and 10th Chief Justice of the US Supreme Court,
was Alphonso Taft, a prominent Republican who served as Secretary
of War under President Ulysses S. Grant
The father of William Howard Taft III (1915-1991), US Ambassador
to Ireland, was Robert Alphonso Taft.
The father of William Howard Taft IV, was William Howard Taft
III.