That 3 generations could have spanned almost the entirety of the US' existence is rather astounding. Yet it is a fact, there is still one of John Tyler's grandchildren left alive.
I first learned two were alive many years ago when an article about this arcane bit of Americana went viral. It's great trivia, but easily forgotten. Yet one of them died, so the trivial knowledge was revived.
What I find just as interesting is the Gardiner name, which the recently deceased held. John Tyler had married a Gardiner daughter. The Gardiners deserve a bit of study. If you have the time I recommend looking them up, and reviewing the history of their island - Gardiner's Island - off the coast of Long Island. Mrs. Bulldog and I were out on the East End last weekend (lovely weekend on Block Island) and the topic of Gardiner's Island was something we began discussing and started reading about. The family (particularly the last "Lord of the Manor") have an intriguing and eccentric history...as does the island itself.