re DNa match

[ciderdrinker]

Hi
I'm writing a genealogical story and for the sake of the plot I need to ask a question about DNA.
I have two sisters and their offspring ,a granddaughter and a daughter .
So a first cousin once removed.
Would they immediately appear as a close match on a DNA  testing site or could I get away with the match being lower down the list and initially missed?

After all if the two sisters only pass on 50% of their DNA to their children it doesn't have to be the same bit does it?


Ciderdrinker

[medpat]

Use the DNA painter

https://dnapainter.com/tools/sharedcmv4

it gives you the ranges for each relationship and many overlap so sometimes high or low cM figures can give you lots of wrong relationships.

High figures can make it seem a closer relationship that what it is and low a more distant relationship to what it really is.

[ciderdrinker]

Hi
Thank you for getting back to me so quickly.
So I had a quick look and really I need to get the DNA down to less that 100 CM
So not a first cousin once removed but twice or a second cousin.
One extra generation on one side and I'm fine.

Thanks for that

Ciderdrinker

[Heb66]

Hello,

I have an official 2C 1R on a 105 cm on my matches....if that's any help to figure out where your DNA match stands in your tree.

Regards....Helen

[IgorStrav]

If it helps, I have a cousin who is descended from my great aunt, so we share great grandparents.

He's my 2nd cousin once removed, all the history has been documented, and we've met.

So I am convinced that our relationship is exactly what we think it is. 

However, our shared DNA is only 17cM, and Ancestry suggests that we are probably 5-8th cousins.

If you look at DNA painter, as suggested, the 2nd cousin relationship is possible, but an outlier.
So much so that in fact someone here suggested that there was a Non Parental Event, and that my great grandmother was his ancestor's mother, but my great grandfather was not.

I think it's rather more likely that in the 'shedding' of DNA from generation was more extreme in our case than in others.

He appears miles and miles down my DNA matches on Ancestry.

However if you are writing a story, bear in mind that the Ancestry Thru Lines facility might show up the relative that you are trying to keep a mystery!!

Good luck with the writing 

[ciderdrinker]

WOW
That is really lovely.
For the purpose of the story I need it took look like one of them is not related to the other.
So when an heir to a Will is being looked for it looks like the paper trail is initially wrong .
It turns out one of the sisters has had an affair but there still needs to be a blood relationship between them so their descendants get the cash.

Ciderdrinker

[IgorStrav]

I think I can probably speak for my 2nd cousin once removed (very nice man) in saying that if our 17cM relationship helps in your story, you just go ahead!! 

[ciderdrinker]

Hello
Thank you.That is so lovely of you

Ciderdrinker