A Rathfelder DNA Match at 23andMe: Iain

I recently noticed a good match I had with Iain at 23andMe. 23andMe predict that Iain and I are 2nd cousins. Fortunately Iain put down some of his family names:

My names are on the left and Iain’s are on the right.

I recognized Rathfulder as a form of Rathfelder. I had already written a Blog on Donna and what was our almost certain relationship. Here is how Donna fits in on my Rathfelder tree:

Here I have added in Iain. He would be Donna’s brother or cousin. Donna did mention that she had a cousin. This shows that Iain is a second cousin once removed to me. Here is my grandfather Alexander Rathfelder on the left and Iain’s great-grandfather Leo Rathfelder on the right:

Donna tested at AncestryDNA. Iain tested at 23andMe. One difference between the two companies is that AncestryDNA does not show detailed DNA matching and 23andMe does. That means that I can compare Iain’s DNA matches with other Rathfelder matches.

My DNA Match with Iain

My DNA match with Iain represents the DNA we both got from our two common ancestors. Those common ancestors are Johann Heinrich Rathfelder born  1846 and his wife Maria E.L. Gangnus born in 1856. Heinrich and Maria were born in the German Colony of HIrschenhof in Latvia. They had nine children in Hirschenhof. Some time between 1890 and 1894 the couple moved to Riga, Latvia where they had their last two children Alexander and Leonhard.

Here is how 23andMe shows my DNA match with Iain:

Those DNA matches look like this in table form:

I can add these matches to my master match list. I can also paint these matches onto my Chromosome map.

DNA Painting Iain

Here is what I have painted so far using an on-line tool called DNA Painter:

This shows all my matches. I’m about 38% painted. Here is just my maternal side where I get my Rathfelder DNA:

Here I am only 28% painted. Iain and I will match on the orange segments. Normally, DNA Painter only adds segments at 7 cM and above. However, there are a few matches I have with Iain just below that cutoff that I want to add:

The differences are difficult to see, but this brings my painted (or identified) DNA up to 39% overall and up to 30% on my maternal side. Not many new orange segments have been added, but segments have been expanded or filled in:

Above is a more detailed view of Chromosome 3. Iain has added to the match that I have with Anita. Iain has also filled in a space in the next segment. Iain does not share DNA with Otis that Inese and Anita do. This would represent more ancient DNA. Otis and I match on the Schwechheimer and Gangnus ancestry. This could mean that even though Iain also has Schwechheimer and Gangnus ancestors,¬† Iain didn’t get the same Schwechheimer/Gangnus DNA at this portion of his Chromosome 3. Nigel and Carolyn above represent DNA that I got from my mother that would not match with Iain because it is on my mother’s non-Rathfelder maternal Lentz/Nicholson side.

Iain and DNA Triangulation

As shown above, Anita and Iain both match me in overlapping segments on Chromosome 3. This suggests DNA triangulation which means the three of us share common ancestors. Those common ancestors are here:

The same thing happens with Catherine and Iain on Chromosome 7:

Iain will match Catherine, Anita and Inese more closely than he matches me as Iain is a 2nd cousin to Anita and Inese and 1st cousin once removed to Catherine. This will show if Iain uploads his DNA results to Gedmatch Genesis for comparison.

Summary and Conclusions

  • DNA has tied together Rathfelder descendants in the US (my family), the UK (Catherine, Donna and Iain) and Latvia (Anita and Inese).
  • Iain tested at 23andMe. His results show specifically how our DNA matches and where. This allows for some DNA comparison.
  • The DNA that Iain and I share represents our common ancestors Johann Heinrich Rathfelder and Maria Elisabeth Laura Gangnus.

 

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