Our 46th president, Joe Biden, does not have curly hair, like I do, and as far as I know, I am not related to him. On the other hand, our 8th president, Martin Van Buren, had very curly hair, and his 3rd great grandfather was my 10th great grandfather, Abraham Pieterszen (van Deursen), who arrived in New Amsterdam in the 1600s. (I am exceptionally grateful to the New York Times for producing this 2011 interactive look at “The Van Dusens Through History.”)