There are four living former U.S. presidents and five living former First Ladies, but a stout 27 living presidential offspring. (Er, at least the ones we know about.) Today's mentalfloss.com Brain Game Think Thursday challenge asks you to identify four of those "First Children." Good luck!

Of the 27 presidential children still living,
four of them are named John.
Identify all four.

Here are the ANSWERS.

THE ANSWERS:

John Ellis "Jeb" Bush,
John William "Jack" Carter,
John Garner "Jack" Ford, and
John Sheldon Doud Eisenhower.

Thanks for playing! Tomorrow - Free-for-all Friday.