When President Hoover and his wife, Lou, didn't want to be overheard, they spoke to each other in Chinese!
FDR was related, by blood or marriage, to eleven other presidents.
President Truman described that atom bomb as "the most terrible bomb in the history of the world."
President Nixon was the first and only person to resign his job as US president.
Jimmy Carter held "family councils" in which his wife and four children could give the president their thoughts on all kinds of issues.