Sonntag, Juli 31, 2022
StartDNATwo’s not the allure… | The Authorized Genealogist

Two’s not the allure… | The Authorized Genealogist

About that “closest” match…

It was certainly one of The Authorized Genealogist‘s objectives for 2022: to establish the closest as-yet-unidentified autosomal DNA match at every of the foremost testing corporations.

Fixing the primary one, at MyHeritage DNA, was simple, because of some very massive hints (like a full actual title for the tester). He turned out, as I anticipated, to be a 3rd cousin, descended from Gustavus Boone and Isabella Rankin (Gentry) Robertson — not shocking, since these Robertson second nice grandparents had 11 children, they usually have left a really prodigious variety of descendants.

The subsequent one — at Ancestry DNA — is “match EL, a predicted 2nd – third cousin with whom I share 125 cM … (and clues that) counsel this could possibly be one other Robertson cousin…”

And, oh boy, is that this one not going to be the allure…

There are some tantalizing clues right here:

• The match dimension of 125cM provides me odds of roughly 75% that it is a third cousin or nearer, based on DNA Painter’s Shared cM Undertaking device, and 96% that it is a third cousin or nearer utilizing Ancestry’s personal knowledge.

• The longest section is 36cM — a wholesome dimension for a 3rd cousin or nearer.

• The highest shared matches between me and EL are all Robertson matches and signify most, if not all, of the kids of Gustavus and Isabella.

• The household places of oldsters in EL’s bushes embody places the place the Robertsons lived in Texas and at occasions overlapping the Robertsons’ time frames.

However then there are some issues:

• EL makes use of a username that not solely isn’t associated to any actual title, it’s additionally not one which seems to have been used elsewhere on-line.

• None of EL’s Ancestry bushes is linked to EL’s DNA take a look at, so there’s no strategy to know for positive if the tester really represents any of the traces proven within the bushes.

• Not one of the on-line bushes exhibits a hyperlink to any of the Robertson aspect of my household.

• EL hasn’t responded to messaging on the Ancestry system.

So… I enter my knowledge into the WATO device at DNA Painter to see what relationship is more than likely for varied ranges of descendants from Gustavus and Isabella, and it tells me my more than likely relationship is second cousin as soon as eliminated (2C1R), with EL being certainly one of Gustavus and Isabella’s nice grandchildren.

However then it happens me that I’m taking a look at a lot much less of the information than I needs to be. I’ve entry to different checks and might see how a lot shared DNA these different kits have with EL. And that’s the place the large glitch exhibits up. As a result of the outcomes are everywhere in the map. In my technology, the shared DNA ranges from my excessive of 125cM to a low of 41cM. And a technology earlier? My aunt shares solely 5cM greater than I do with EL: 130cM. And my maternal uncle shares lower than I do: 108cM.

Now what does the WATO device say? It tells me the strongest case is for EL to be the second nice grandchild of Gustavus and Isabella — so a 3d cousin to me and a 2C1R to my aunt and uncle. Or — with precisely the identical chance, after all — EL could possibly be a 3d cousin to me and a 2C1R to my aunt and uncle if EL is the grandchild of any sibling of both Gustavus or Isabella. And although it is probably not terribly doubtless {that a} residing tester right this moment can be a sibling’s grandchild due to the time frames concerned, the potential for long-tailed generations means I can’t rule it out fully.

And, after all, it additionally tells me that it’s nonetheless fully doable for this to be a second cousin to my aunt and uncle and a 2C1R to me and people in my technology, as an ideal grandchild of any sibling of both Gustavus or Isabella. I do in actual fact have a recognized 2C1R in precisely that line of descent — he’s youthful than I’m, born when his father was 51 years previous. That father, in flip, was born when his personal father was 58 years previous.


This one’s gonna take some work.

Two is unquestionably not the allure.

Cite/hyperlink to this submit: Judy G. Russell, “Two’s not the allure…,” The Authorized Genealogist ( : posted 15 Could 2022).


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