This is jiayo, thank you for looking.

Robert Todd Lincoln, the first son of Abraham Lincoln, was present, or nearby three (three!) presidential assassinations: April 14, 1845, he was at the White House while his father was shot at the Ford’s Theatre; on July 2, 1881, he witnessed James Garfield’s being shot at the Sixth Street Train Station in DC; and on September 6, 1901, he was at the Pan-American Exposition when William McKinley was shot (McKinley died about a week later).