Sandy,
Since the John Davidson mentioned in association with the marriage bond of Joseph Davidson and Jinny Wilson in 1805 was the BROTHER of Joseph (I did not know that before your post), then that means that this John Davidson was the John Davidson who had married Sally McRea in Rockbridge Co., VA on 8 Jan 1801. Sally McCrea was a daughter of Mrs. Elizabeth McCrea (who some say also had the maiden name of "Wilson"), via Elizabeth's first husband Joseph McCrea. As you know, the widow Elizabeth McCrea married second William Davidson, the father of the above Joseph and John Davidson, on 2 Feb 1792 in Rockbridge. William Davidson's first wife (who he married up in PA) had apparently died, and William married second to Mrs. McCrea, after William migrated from PA to VA.
Since it was Joseph's brother John who was mentioned above, that means that the older John Davi(d)son who married Mary Allison, and who died in his old age in Rockbridge around 1802, MAY not have been associated with/related to your family after all. That older John Davidson/Davison had a son named Robert, so MAYBE it is more likely that he represented a branch of the older Robert Davidson/Ann Dunlap (supposedly Ann's maiden name) family in Augusta Co., VA. A living male descendant of this older Robert Davidson (Robert died in Augusta in 1751, as I recall) is part of "DNA Family 12" on the DNA website, versus your "DNA Family 16." My Davidson family ("DNA Family 10") intermarried on two occasions with the above John Davidson/Mary Allison family, so I remain quite interested as to which family this older John Davidson truly belonged. Maybe a living male Davidson from this family will eventually join the DNA testing project.
Augusta Co., VA had at least FIVE "unrelated" Davidson/Davison/Davisson families at various times in the 1700s. "Conventional documentation research" always seemed to indicate that these five families were PROBABLY not related, and sure enough, DNA testing has now proven that they were not related. I don't know if the John Davidson who married Mary Allison was a part of Family 12 versus Family 16, versus a part of yet some sixth Davidson/Davison/Davisson family in Augusta Co., VA.
Bill Davidson
http://archiver.rootsweb.ancestry.com/th/read/DAVIDSON/2008-09/1222729150
