John Blair & Martha ______
Hugh Blair & Mary Dawson

Conventional Research
There has been much debate over whether Hugh Blair (who married Mary Dawson) is the son of John Blair and Martha ________  of Guilford Co., NC. There are those who believe he the son and those who believe he is not. Some believe that Hugh and John are brothers. So far there is no documentation to prove or disprove how or if  Hugh and John are related. Futher complicating the debate is the fact that there is no confirmed date of birth for either John or Hugh. Depending on the pedigree you look at John was born between 1700 and 1725, and Hugh was born between 1706 and 1720.

DNA Testing
So far we have one participant (#4189) who descends from John and Martha through son John and three participant (#12276, #189629, and #273766) who claim to descend from Hugh Blair and Mary Dawson. All four participants have tested at least  37-markers. The table below shows how the four participants match on 37 markers:

The actual marker values for each participant are shown in the table below.

The diagram below show the submitted pedigrees of the four participants based on conventional research.

Conclusions

Descendants of John Blair and Martha
Since there is only one participant (#4189) who descends from John and Martha we have nothing the compare his results to.

Descendants of Hugh Blair and Mary Dawson
The DNA test results PROVE that the three participants who claim to descend from Hugh and Mary can NOT be related. The closest they match each other is 25 of 37 markers. Only one of the three could possibly descend from Hugh and Mary, but it's impossible to tell from DNA testing which of them is the descendant.

Connection between Hugh Blair and John Blair.
In this case DNA test results neither confirms or refutes the possibility that Hugh is the son of John.

If participant #12276 is the actual descendant of Hugh and Mary then it is almost certain that Hugh and John share a common ancestor, but this common ancestor could be several generations removed. While it is still possible they are father and son, they could also be brothers or distant cousins.  Both participants (#4189 and #12276) are part of Group 1 and share the same 25-marker test results with 28 other participants. They also match 37 participants on at least 34 of 37 markers.

If either participant #189629 or #273766 is an actual descendant of Hugh Blair and Mary Dawson then there is NO way that Hugh and John Blair and related. The closest that either #189629 or #273766 matches #4189 is 24 of 37 markers (13 mismatches).

This WebPage was last updated 04/05/2015