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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. So far there is no documentation to prove or disprove
that Hugh is John's son. 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 one participant (#12276) who descends from
Hugh Blair and Mary Dawson. Both participants have tested and match
on all 25-markers. They also match 36 for 37 markers. These test results
clearly indicate that John and Hugh share a common ancestor.
The actual marker values for each participant are shown in the table below.
| Marker |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
32 |
33 |
34 |
35 |
36 |
37 |
| |
DYS# |
PART
ID# |
3
9
3 |
3
9
0 |
1
9
* |
3
9
1 |
3
8
5
a |
3
8
5
b |
4
2
6 |
4
3
8 |
4
3
9 |
3
8
9
i |
3
9
2 |
3
8
9
ii |
4
5
8 |
4
5
9
a |
4
5
9
b |
4
5
5 |
4
5
4 |
4
4
7 |
4
3
7 |
4
4
8 |
4
4
9 |
4
6
4
a |
4
6
4
b |
4
6
4
c |
4
6
4
d |
4
6
0 |
G
A
T
A
H
4 |
Y
C
A
II
a |
Y
C
A
II
b |
4
5
6 |
4
0
7 |
5
7
6 |
5
7
0 |
C
D
Y
a |
C
D
Y
b |
4
4
2 |
4
3
8 |
| 4189 |
12 |
24 |
14 |
11 |
11 |
15 |
12 |
12 |
12 |
13 |
13 |
29 |
15 |
10 |
10 |
11 |
11 |
26 |
15 |
19 |
30 |
14 |
15 |
17 |
18 |
12 |
10 |
19 |
23 |
15 |
16 |
18 |
17 |
35 |
38 |
12 |
12 |
| 12276 |
12 |
24 |
14 |
11 |
11 |
15 |
12 |
12 |
12 |
13 |
13 |
29 |
15 |
10 |
10 |
11 |
11 |
26 |
15 |
19 |
30 |
14 |
15 |
17 |
18 |
12 |
11 |
19 |
23 |
15 |
16 |
18 |
17 |
35 |
38 |
12 |
12 |
The diagram below show the pedigrees of the two participants based on conventional research.
Conclusions
In this case DNA test results neither confirms or
refutes the possibility that Hugh is the son of John. 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 are part of Group 1 and
share the same 25-marker test results with 22 other participants.
They are also a very close match to 19 others (off by a distance of
no more than 2 of 25).
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