Beau Biden
The most recent presidential child to die was Beau Biden, the son of Joe Biden, who died on May 30, 2015 at the age of 46, before his father became president. The most recent presidential child to die who lived during their father's presidency was John Eisenhower, the son of Dwight D. Eisenhower, who died on December 21, 2013 at the age of 91. He was also the father-in-law of Julie Nixon Eisenhower, another presidential child.