I don't know if we have some of the same Black's or not. My gggrandfather was James E. Black, he was the Sheriff of Rock County, Luverne, MN. for 26 years. He had some brothers and sisters. I just found out their names, But none of them match what you have. So it could be some connection some how, but I don't know, what are the ages of these people of yours. Are they from years past, or are they closer generations? See what you can dig up.