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Bernie, I'd like to offer one clarification to your posting. There were 18 children born to Elizabeth Blair Bolling and John Bolling, Jr. You have listed (as did Wyndham Robertson in his 1887 book) the seven who made it to adulthood AND who had children. There was an eighth child (Edward Bolling: 1746-1770) who lived to adulthood but who had no offspring of his own. The eight are all cited in the will of John Bolling, Jr.
When he wrote his book Wyndham Robertson had the choice of naming the "died young" offspring of John and Elizabeth Blair Bolling or only listing those who had children of their own. He chose the latter and his choice greatly affected the future of Pocahontas-related genealogy. Names such as Benjamin, Rodney, William, Meotaka and others were plugged into the giant vacuum he left by people who assumed that their Bolling/Bowling/Bolding ancestors (Benjamin, Rodney, William etc.) must have been descendants of Pocahontas. Robertson could have prevented lots of confusion by drawing on the name-by-name list copied by his cousin Blair Bolling from the original family Bible. Instead he cited many births but listed only seven names, inadvertently promoting a "fill in the blanks" genealogical exercise.
Recent research and DNA tests have substantiated your "bottom line" on Benjamin and (for that matter) the other "blue Bollings." I just wanted to add Edward to your list because he's in his dad's will and his brother Robert's "Memoir." Best, Fred