I think he may have been called "Neil Patterson." If so, he was my great grand father's half brother. My great Grandfather was named Lee Patterson. According to my Dad, Neil had a white father and Lee had an African grandfather. They had the same mother. According to family search.org Neil's father was Ned Bocock, Lucy's owner. I've cut and pasted the info. Hopefully you can work through the format or cut and paste the url I'm providing below.
Cornelius Crawford Patterson
Virginia, Marriages, 1785-1940
birth: 1854 Appomattox Co.
marriage: 21 November 1876 Lynchburg County, Virginia
father: Ned Bocock
spouse: Lucy Bocock
According to: https://familysearch.org/search/record/results?count=20&...