Author Topic: DNA ethnicity logic check / Unexpected result  (Read 10633 times)

Online brigidmac

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Re: DNA ethnicity logic check / Unexpected result
« Reply #108 on: Sunday 19 June 22 08:43 BST (UK) »
That's s great example Annie and of course even when you have known siblings there's always the chance of another conceived prior to marriage ,adopted and going by a different name
Roberts,Fellman.Macdermid smith jones,Bloch,Irvine,Hallis Stevenson

Online brigidmac

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Re: DNA ethnicity logic check / Unexpected result
« Reply #109 on: Monday 20 June 22 00:38 BST (UK) »
# sorry duplicate post
Roberts,Fellman.Macdermid smith jones,Bloch,Irvine,Hallis Stevenson

Offline Rosinish

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Re: DNA ethnicity logic check / Unexpected result
« Reply #110 on: Monday 20 June 22 03:52 BST (UK) »
That's s great example Annie and of course even when you have known siblings there's always the chance of another conceived prior to marriage ,adopted and going by a different name
Brigid,

Of course I'd considered other factors when looking at the DNA amounts etc.
There's more 'circumstantial' evidence other than what I posted.
The family emigrated 40 yrs prior to the birth of my match when the 'biological' father was a child (the youngest) & his mother was a widow already in her mid 50s.
There's no sign of any illegitimate children born prior to the marriage (1888) on any census' prior to emigration nor on passenger lists, later census', MIs, Obituaries etc.

I think the 'circumstantial' evidence is quite weighty as a possible illegitimate child prior to the marriage would have been at least in his late 60s - early 70s (although not impossible).

However, the 'biological' father was also known in circles to the family of my match (including my match) which almost spells it out.

Annie
South Uist, Inverness-shire, Scotland:- Bowie, Campbell, Cumming, Currie

Ireland:- Cullen, Flannigan (Derry), Donahoe/Donaghue (variants) (Cork), McCrate (Tipperary), Mellon, Tol(l)and (Donegal & Tyrone)

Newcastle-on-Tyne/Durham (Northumberland):- Harrison, Jude, Kemp, Lunn, Mellon, Robson, Stirling

Kettering, Northampton:- MacKinnon

Canada:- Callaghan, Cumming, MacPhee

"OLD GENEALOGISTS NEVER DIE - THEY JUST LOSE THEIR CENSUS"

Online brigidmac

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Re: DNA ethnicity logic check / Unexpected result
« Reply #111 on: Monday 20 June 22 08:18 BST (UK) »
I think circumstantial may be the answer to person I'm helping
Combined with DNA evidence

The bio father would have been 17 years older than his bio mother and not at all the name she told  her child .


Roberts,Fellman.Macdermid smith jones,Bloch,Irvine,Hallis Stevenson


Offline AndyH81

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Re: DNA ethnicity logic check / Unexpected result
« Reply #112 on: Tuesday 04 October 22 12:54 BST (UK) »
Well, there has been a further development. A man who was the brother of the suspected aunt in this scenario (so would be my uncle) has done a DNA test too and has also come back as a close match - albeit not as close as his sister.

So I now have the following results:

BC (Suspected FC1R) and I share: 7.7% of our DNA, 543.2 cM, 25 segments with the largest being 71.1 cM.

PW (Suspected FC) and I share: 16% of our DNA, 1,130.7 cM, 37 segments with the largest being 88.1 cM.

PI (Suspected Aunt) and I share: 30.4% of our DNA, 2,153.5 cM, 41 segments and the largest is 166.3 cM

DP (Suspected Uncle) and I share: 22.6% of our DNA, 1,599.6 cM, 38 segments and the largest 136.9 cM.

Further to this, the man we suspect who may be my half-brother (by proxy of all the circumstantial evidence) is also doing a test and his result should be available this week.

What I am curious about is the DNA testing. I know DNA ranges can fluctuate anyway naturally, depending on the nature of the relationship and the sex of the person involved but both the potential aunt and uncle either come close to the 25% DNA / 1,750 cM threshold - or exceed it; however, their father died 10 years before I was born, so there's no possible way they and I could be the half-siblings. As such, if the assumed half-brother comes in around the same percentage, presumably there'd be no way from those numbers to distinguish the nature of all our relationships other than circumstantial evidence - so is there any kind of DNA test that he and I could take that would definitively tell us whether or not he and I are cousins or half-brothers?

Unfortunately his/our father is dead, so it's not an option for us to use him as a basis for comparison. My mother is dead, so I cannot get a sample of her DNA to use that to distinguish, and his own mother is completely in the dark about what is happening as they're concerned it will upset her - so she's out of the picture too. Is there any way to know for sure if there's no other way of obtaining DNA which would help establish specific differences?

Offline Biggles50

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Re: DNA ethnicity logic check / Unexpected result
« Reply #113 on: Wednesday 05 October 22 15:12 BST (UK) »
Promising and frustrating all rolled into one.

The only way of obtaining DNA is with co-operation and approval.

Online DNA results is also dependent upon the person allowing their results to be compared by they uploading to comparison sites like Gedmatch.  Talking of Gedmatch if you can link each of the matches together then creating a tree and uploading it and using the WATO tool may help,

I have recently had verbal conversations with two of my DNA matches who are at the 3C level and in the course of the discussions they both stated that they found each other via DNA and that they do in fact share the same and between them they share 1950cM so this gives you an idea of what you could expect.

For a Cousin or 1/2 Cousin expect c900 & 450cM respectively if you are of the same generation but could there be a generation removed in the relationships, if so they will skew the relationships.  DNA Painter is your friend.

Offline AndyH81

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Re: DNA ethnicity logic check / Unexpected result
« Reply #114 on: Thursday 06 October 22 13:13 BST (UK) »
There has been one final DNA development:

DJ. He and I share 27.2%, 1,929.2 cM, 38 segments with the largest being 127.5 cM.

There were two possibilities: Uncle or half-brothers. His relationship matched with all the others as expected, meaning there was only one possibility left: he is a half-brother.

So I guess now we know who my biological father is too.

What a weird year this has been!!

Offline Carmella

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Re: DNA ethnicity logic check / Unexpected result
« Reply #115 on: Thursday 06 October 22 20:48 BST (UK) »
Hi Andy

Great news!
Congratulations on this DNA breakthrough after months of various DNA tests and hard work.
You are an inspiration to those of us still working on mystery DNA clusters and matches!

C

Offline Rosinish

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Re: DNA ethnicity logic check / Unexpected result
« Reply #116 on: Friday 07 October 22 02:36 BST (UK) »
DJ. He and I share 27.2%, 1,929.2 cM, 38 segments with the largest being 127.5 cM.

There were two possibilities: Uncle or half-brothers. His relationship matched with all the others as expected, meaning there was only one possibility left: he is a half-brother.

So I guess now we know who my biological father is too.
Fantastic news on proving who your biological father was!

I hope...having gone to extremes to find out & having succeeded, at some stage you will both feel comfortable enough to eventually meet up.

I have a very, very close connection with my match, I'm 99% sure of how we match & I'd be over the moon to meet at some stage...however...

My match would be in your shoes as the 'illegitimate' child of an affair & may be feeling how you feel at the moment, just curious (being the 'outsider') wishing to know their identity?

I've sent messages (all unread to date) in the hope of a reply & I'd be more than willing to help with their 'curiosity' as I know (99.99%) who their bio' father is, half siblings & their ancestors.

I'd understand if my match only wanted to find out where they descended from & not necessarily want to meet up with family members although I'd love to meet up at a later date if my match decided they wanted to.

Annie

South Uist, Inverness-shire, Scotland:- Bowie, Campbell, Cumming, Currie

Ireland:- Cullen, Flannigan (Derry), Donahoe/Donaghue (variants) (Cork), McCrate (Tipperary), Mellon, Tol(l)and (Donegal & Tyrone)

Newcastle-on-Tyne/Durham (Northumberland):- Harrison, Jude, Kemp, Lunn, Mellon, Robson, Stirling

Kettering, Northampton:- MacKinnon

Canada:- Callaghan, Cumming, MacPhee

"OLD GENEALOGISTS NEVER DIE - THEY JUST LOSE THEIR CENSUS"