The New York Times, with its usual level of accuracy, was in the habit of saying that George W. Bush is a descendant of President Franklin Pierce. President Pierce had three children, all of whom died in childhood (the last of them in a train wreck shortly before Pierce entered the White House), so he has no living descendants.
And you can trust the NYT to get it wrong. If they said the sun rose in the east, I would look outside and check.