John Tyler, born in 1790, became America's tenth commander-in-chief in 1841. After doing the math, it seems incredible that the former president could still have two living grandchildren.

Tyler had 15 children during his lifetime, making him one of the most prolific presidents in American history. Today, he has two living grandchildren, Lyon Gardiner Tyler, Jr., who is 87 and lives in Tennessee, and Harrison Ruffin Tyler, 84, who lives on Sherwood Forest Plantation, a national historic landmark in Virginia.

In the past two decades, one or two presidential kids have been the norm. But the 2012 GOP baby boom could change that.