What are the odds of someone being born in the 18th century having grandchildren – yes, GRANDCHILDREN – who are alive in the 21st century? Pretty infinitesimal most people would say and they would be right. But a confluence of factors resulted in just such a thing happening with none other than the tenth president of the United States – John Tyler! John Tyler was born in 1790 and has grand-children who are still living today, 222 years after the birth of their grand-father! Tyler succeeded William Henry Harrison who died after 32 days in office from pneumonia. He was born at a time when Napoleon Bonaparte was busy conquering…