4. Abraham Lincoln, 1809-1865
When Abe Lincoln was president, the White House pitter-pattered with the sound of children's feet. Lincoln adored his children and reportedly gave them free reign to run, play and even interrupt Cabinet meetings.
The Lincolns had four children, but only one, Robert Todd Lincoln, would live to adulthood. The deaths of their children left the Lincolns reeling. When 11-year-old Willie died in 1862, Lincoln wrote, "I know that he is much better off in heaven, but then we loved him so. It is hard, hard to have him die!"