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Edward Blair & Sarah Harrison
Robert Blair & Rose Colquohoun

Participant 7986 descends from Edward Blair and Sarah Harrison
Participants 15114 and 25464 descends from Robert Blair and Rose Colquohoun

The DNA test results from the three participants certainly support the belief that they share a common ancestor. If Edward and Robert are not brothers it is almost certain they are cousins. The two participants (15114 and 25464) who descend from Robert match 25 for 25 with each other and match 24 for 25 with participant 7986 who descends from Edward.

FTDNATiP™ Report
Family Tree DNA Time Predictor*

In comparing 25 markers, the probability that 15114 & 25464 and 7986
shared a common ancestor within the last...
4
Generations

is

27.04%
8
Generations

is

57.49%
12
Generations

is

77.60%
16
Generations

is

88.85%
20
Generations

is

94.66%
24
Generations

is

97.50%
Knowing that that 15114 & 25464 and 7986 could not have had a common
ancestor in the last 4 generations, their 25 marker comparison shows that
the probability that they shared a common ancestor within the last...
4 - 8
Generations
is

39.46%
12
Generations

is

67.47%

16
Generations

is

83.62%

20
Generations

is

92.08%

24
Generations

is

96.28%

8
Generations

is
98.29%

* The FTDNATiP™ results are based on the mutation rate study presented during
the 1st International Conference on Genetic Genealogy, on Oct. 30, 2004.
The above probabilities take into consideration the mutation rates for each individual
marker being compared.

The actual marker values for the two participants 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
  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
3
8
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
7986 13 26 14 11 14 15 12 12 11 13 13 29 18 9 10 11 11 26 15 19 31 15 16 16 18
15114 13 26 14 11 14 15 12 12 11 13 13 29 19 9 10 11 11 26 15 19 31 15 16 16 18
25464 13 26 14 11 14 15 12 12 11 13 13 29 19 9 10 11 11 26 15 19 31 15 16 16 18

 

The Oldest Ancestors are shown below

Ancestor #0043
Part. ID# 7986

  Blair Ancestor: Edward Blair
Birth:   1810 County Derry, Ireland
Marriage:   Unknown Unknown
Death:   Nov 1850 Roxborough Township, Stormont Co., ONT, CAN
Wife: Sarah Harrison
Birth:   Abt. 1811 Ireland
Death:   Unknown Missouri, USA (not validated)
Remarks: Edward Blair is believed to be the brother of Robert Blair who married Rose Colquohoun

Ancestor #0059
Part. ID# 15114, 25464

  Blair Ancestor: Robert Blair
Birth:   1790 IRE
Marriage:      
Death:   1870 Ontario, CAN
Wife: Rose Colquohoun
Birth:   1791 IRE
Death:   1868 Ontario, CAN
Remarks:  

Given the traditional genealogical paper trail, the fact that both Edward and Robert were born in Ireland within 20 years of each other, that both settled in Ontario Canada, coupled with the closeness of the DNA test results and a very rare combination of values on markers #390, #385a, and #385b (they are the only ones to have 26-14-15 in over 4000 results I have analyzed), there is very strong support to believe that Edward and Robert are in fact brothers.

The diagram below show the pedigrees of the two participants based on conventional research

 

 

  Contact the Blair DNA Project Coordinator 

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