Robert Lincoln had that dubious honor.
Abraham Lincoln's son was invited to the assassinations of three U.S. Presidents: The night that his father was shot, Robert Lincoln was invited to accompany his parents to the theater. He declined. When President Garfield was shot in a Washington, D.C. train station in 1881, he was present at Garfield's invitation. When President William McKinley was shot in 1901 at the Pan-American Exposition in Buffalo, New York, Lincoln was present at McKinley's invitation. Although Robert Lincoln was not an actual eyewitness to any of these assassinations, after McKinley's death, Lincoln let it be known that he wanted no further invitations from any US president. Three presidents had unknowingly invited him to be present at their assassinations. Interestingly enough, Robert Lincoln would not have been able to attend these events had not the brother of John Wilkes Booth saved his life years earlier.
John Adams and his son John Quincy Adams were US presidents from Mass.
The last name of the father and son presidents is Bush.
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John Quincy Adams and George W Bush
Adams (John and son, John Quincy)Bush (George and son, George W)Harrison (Benjamin and grandson William Henry)Roosevelt (Theodore and Franklin were fifth cousins to one another)
2 Father son combos, The Bushs and The Adams
There have only been two father and son combinations to occupy the White House - John Adams and JQ Adams, George H W Bush and George W Bush. In addition, a grandfather and grandson, WH Harrison and Benjamin Harrison, have been Presidents.
The only member of a father and son combination to be elected twice was the son, George W. Bush. The father, George H.W. Bush as well as both Adamses were one-term presidents.
George W Bush
Dwight D. Eisenhower