President Abraham Lincoln With Son Tad, 1865

 Tad Lincoln was a handful, a rambunctious youth who ran wild in the White House and was known to interrupt his father's meetings. His father spotted this restless quality at birth, giving him the nickname "Tad" because the baby was "as wiggly as a tadpole." Though Tad outlived his father, his life was not long, as he died suddenly in 1871 at the age of 18.