This one really has me confused. I have the Shelby(Selby) Lineage from Phillip Selby. When I looked up my database on Shelbys, I found John Alexander m. Sarah Shelby.Here is where I am confused. I have information on this family.Source: "Descendants of John Alexander by Ninah" which confirms your information but it also show his parents as James and Rachel.Source"Brevard" shows John Alexander, son of James & Rachel, (1772-1774)Sometimes Brevard is true and sometimes not, I don't always go with Brevard. Sarah(Sallie) is also a sister of Isbel Shelby married to Stephen Winslow Alexander. If you need further information on John Alexander, let me know.