Why we all love genealogy

Did you hear that John Tyler, the 10th president of the United States, has two grandsons alive and well and living in Virginia? President Tyler was born in 1790 which 'computes' to two grandchildren alive 222 years later. In 1853 at age 63, Tyler's son, Lyon Gardiner Tyler, was born. Okay so far. 71 years later, in 1924, Lyon's son Harrison was born, and in 1928 his son Lyon, Jr., was born. So here we are with two octogenarians separated by only two generations from a man who might have met George Washington. Wow!