Keith’s McMaster DNA and Genealogy

From what I can tell, Keith is my best DNA match on the McMaster side. Here is how Keith appears at AncestryDNA:

Keith is a Shared Ancestor Hint. That means we have common ancestors and shared DNA. Here, Keith shows as my 3rd cousin once removed. Keith is an especially good match because he doesn’t show any recent Frazer ancestor that could confuse the DNA match. Also, Keith uploaded his DNA results to which means that we can compare more specific DNA matches and figure out how they relate to our shared ancestors.

McMaster Genealogy

My McMaster Genealogy for this Blog focuses on those who have taken a DNA test. Here is Keith’s Tree as seen at Ancestry:

Note that our shared McMaster Line also includes a Margaret Frazer. However, this match is further back and will be less likely to show up in a DNA match.

Here are the McMasters that I know of that have had their DNA tested:

Any DNA matches that Keith has with my family (Joel) or with Emily, and Paul will represent the DNA from James or Fanny McMaster.

A Summary of My McMaster Genetic Genealogy Research So Far


John is in the lower left of the chart above. I wrote about him here. John tested at MyHeritage which is good, but I don’t think he has uploaded to If he did, that would show how he matches others with McMaster ancestry that haven’t tested at MyHeritage.

Stephen and Ron

I have these two as descending from Thomas Leroy McMasters. However, I have Edward as the son of Abraham. This seems unlikely has Abraham was born about 1764 and Edward was born in 1851. Here is my correction based on my Blog of Stephen and Ron here.

What I found out about Stephen and Ron was that I am more closely related to them on my Clarke side than on my McMaster side. Stephen tested at 23andme. 23andme is not compatible with Gedmatch with their current testing method. I believe that Ron has tested at MyHeritage and AncestryDNA, but has not uploaded his results to which makes DNA comparison more difficult.

Emily and Paul

Emily, Paul and my family have common Frazer and McMaster ancestors. That means that I can’t tell which of our shared DNA is Frazer or McMaster without independent Frazer or McMaster matches on the same segment of the Chromosome.

My Match with Keith at Gedmatch

Here is how I match Keith at Gedmatch:

Based on the amount of DNA we share, Gedmatch estimates that our common ancestors are 4.7 generations away. Keith and I are 3rd cousins once removed, which means that our common ancestors are 3.5 generations away. The once removed accounts for the half generation. However, these numbers are based on averages and I share less than the average amount of DNA with Keith. For example, my brother Jim shares about twice the amount of DNA with Keith compared to me:

Painting My DNA

There is an on-line utility called DNA Painter. That is a fun way to figure out what DNA you got from whom. This match with Keith shows DNA that we both got from James and Fanny McMaster. Here is what I have so far:

The top bar of each chromosome is my paternal side. That is where I am related to the McMasters. I match Keith from position 3 to 10 million. That is at the beginning of Chromosome 19 which is currently blank. At the right side of Chromosome 19, I have DNA from George Frazer and Margaret McMaster (the daughter of James and Fanny McMaster).

Here is the update at the beginning of Chromosome 19 in a light shade of blue:

In the key, I now have James and Fanny McMaster. James was born about 1806. This couple is in a section which represents my father’s mother’s side. This is the largest of my four grandparent groups in the key above.

A Triangulation Group (TG) for Keith

A Triangulation Group is when three or more people match each other by DNA. When this happens, this is almost certain proof that the DNA came down from the same ancestor.  Here is Keith’s match with Emily and Paul on Chromosome 12:

In order to make sure this is a true TG, we need to see if Paul and Emily also match each other on Chromosome 12 around position 92M:

Yes, it looks like they do.

We were already pretty sure by genealogy that Keith, Emily and Paul had the same two McMaster 2nd great grandparents, but the DNA also confirms it.

The fact that no one in my family is in the TG does not mean that we do not also descend from James and Fanny. It just means that we didn’t share the same exact portion of DNA that Emily, Paul and Keith did.

Shared Matches at AncestryDNA

AncestryDNA does not show specific Chromosome matching information, but it does show shared matches. These shared matches tend to indicate that I match Ron on the Clarke side and Keith on the McMaster side. I have 12 shared matches with Keith at AncestryDNA. Three of those 12 are my sisters. The remaining 9 are guessed to be 4th cousins by DNA. Ancestry only looks at Shared Matches out to the 4th cousin level.

Here is the comparison:

I have my comparison with Keith in the right hand box above. I also included Keith’s comparison with two of my sisters. These matches should represent those with McMaster ancestry. On the left box, I have my AncestryDNA Shared Matches with Ron. These people should represent those on my Clarke side. The point is, that these are two different groups. The only Shared Match was GG. This could mean that GG has Clarke and McMaster ancestry, or she is matching both Ron and Keith with McMaster ancestry.

I also note that BV is a strong Shared Match between Keith and my family. BV has a Maryann McMaster born 1819 in her tree as a direct ancestor. Here is Maryann’s photo from Ancestry:

MaryAnn McMaster – But Which McMaster?

BV at Ancestry doesn’t have information on MaryAnn’s parents. By DNA, Maryann could be related to me on my James McMaster side or my Fanny McMaster side. That makes things a little more complicated. I have that James’ father was Abraham McMaster. Here is what I have on my McMaster Web Page:

Note that I have a Marrianne, daughter of William McMaster and Margaret Frazer baptized 9 January 1820. This must be the same as BV’s Maryanne. Here is how I show I’m related to BV:

This shows that I am a 3rd cousin, twice removed to BV. That is equivalent, by DNA, to a 4th cousin. Now I just need to add some other McMasters:

This shows that BV is a 3rd cousin once removed to Emily, Paul and Keith. If BV uploads her DNA to Gedmatch, that could give clues on our common McMaster and Frazer ancestors. This tree also shows that BV is related to those on the right side of the chart on the Fanny McMaster and not the James McMaster side.

Putting the Two McMaster Lines Together

This comes out a bit small. The McMaster/Frazer Line is on the left. The Abraham Line is on the right. Note that Abraham as shown is about 26 years older than William McMaster. That means he could be an uncle to William or even a father to William. However, I doubt that William was the son of Abraham as that was not mentioned in William’s Lease of land:

I assume that the William and elder Abraham are the two lines I have above. In the lease above, it is stated that Abraham had a son named Abraham, but does not mention William as Abraham’s son.

Summary and Conclusions

  • Keith is the first good McMaster match who has also uploaded his DNA results to Gedmatch for comparison.
  • Keith tested at Ancestry. As a result, shared matches between Keith and my family are likely along the McMaster Line.
  • B.V. is a good shared match between my family’s AncestryDNA results and Keith’s AncestryDNA results. She also has a McMaster ancestor from Ireland that fits into research I had previously done on the McMaster family.
  • Finally, I combined the Abraham McMaster Tree and William McMaster/Margaret Frazer tree to see how they fit together. I have them lined up by the current generation at the bottom. However, that might not be the way they should be lined up.




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