US President Joe Biden lost his eldest son Beau Biden to brain cancer

Beau's death due to brain cancer in 2015 was the reason why the then-Vice President Biden didn't seek the White House in 2016. Biden on Tuesday said that his one regret was that Beau, who served as attorney general in Delaware, was not there. He became emotional during a brief farewell ceremony in Delaware and said, "When I die, Delaware will be written on my heart."