10
votes
Sharing 52% DNA with mother
This could also be explained if the parents share DNA. If you took the same test with your father and it also was > 50%, it could indicate they are distantly related. A single shared chromosome ...
- 201
8
votes
Predicted percentages of shared DNA for DNA tests of half-siblings?
The ISOGG Wiki's article on Autosomal DNA statistics explains the concepts in the previous answer in much more detail -- and includes links to the AncestryDNA white paper that explains Ancestry's ...
- 24.9k
8
votes
Can the amount of saliva affect how many centiMorgans are shared between 1st cousins?
Absolutely not.
The amount of saliva is a factor in whether or not you get DNA results at all. If you have them, that's it. While there is such a thing as "partial results" it's because you need ...
- 2,436
7
votes
Is a half-sibling match on AncestryDNA reliable, or is more testing needed?
The result should be reliable in that it shows a close relationship. As shown on the Autosomal DNA statistics page on the ISOGG Wiki, the relationship is almost certainly one of these:
one of you is ...
- 3,857
6
votes
Is a half-sibling match on AncestryDNA reliable, or is more testing needed?
Just a note that you should not automatically jump to the conclusion that you and your probably-half-sibling must share a father instead of a mother; young unmarried pregnant women were often ...
- 1,860
6
votes
Can half siblings share no common DNA?
The tests can be trusted. You are not half-sisters.
Paternal half-sisters, minimally speaking, share an entire X chromosome, as females inherit one X chromosome from their father. Beyond that, they ...
- 981
6
votes
Determining if 2nd cousin is father from DNA test?
A person will share roughly 3% of their DNA with a second cousin. A person shares 50% of their DNA with their father. If you have the luxury of testing the autosomal DNA of both the person and the ...
- 18.6k
6
votes
Accepted
Determine family from obituary
Personally I would parse it as follows:
Deeply missed by their seven children (numbered 1-7) and their spouses, 26 grandchildren (letters a-z) and their spouses, and 7 great-grandchildren (letters A-G)...
- 250
5
votes
Accepted
Determining likely relationship based upon autosomal DNA shared cM
The Shared cM Project 4.0 tool v4 from DNA Painter project mentioned in this blog post makes it simple.
To jump straight to the relationships a 2,200 cM match may suggest just append the number at the ...
- 5,267
5
votes
Could "Our Mother" be a term of endearment on 1855 headstone?
My initial assessment is:
I think it quite unlikely that someone would be referred to "Our Mother" on a headstone, without some mother-child relationship present.
It may not be a genetic mother-child ...
- 18.6k
5
votes
Accepted
What is "dritter Grad der Blutsverwandtschaft" (third degree/grade of blood relationship)
Second cousins would be the "third degree of blood relationship". People who were related more closely than that were not permitted to marry (without special dispensation).
Source - Wikipedia
As the ...
- 5,166
5
votes
Predicted percentages of shared DNA for DNA tests of half-siblings?
The range of DNA shared between half-siblings and first-cousins overlaps (see The Latest Results from the Shared CM project); you and your half-sibling might have a shared DNA amount at the low-end ...
- 51
5
votes
Determining if an autosomal and X-DNA match is my half-sibling?
A possible explanation for these results is that you have more than one relationship – maybe you are half-siblings and also share a more distant relationship on your mother's side. For example, the ...
- 18.6k
5
votes
Is AncestryDNA match of 2,063 cM a half sibling?
The Shared cM Project 3.0 tool v4 suggests these possible relationships for 2,063 centimorgans:
I think the age difference of just a few years between you and this person lets us rule out grandparent ...
- 11.1k
5
votes
Accepted
Distinguishing half siblings from cousins using AncestryDNA?
According to the Shared cM Project, a 1390 cM match is in your case much more likely (90%) to be either a half sister or an aunt/niece than it is (10%) of being a first cousin, half-aunt or half-niece....
- 16.6k
5
votes
False-Positives in Autosomal DNA Matches
Ancestry DNA uses scientific methods to attempt to give you valid matches. They use their own proprietary technique to detect Identical by Descent (IBD) segments and to match people. They work to ...
- 16.6k
5
votes
How can two different generations of one family be a half sibling to an outsider?
Half-sibling is not the only likely relationship at that cM range, it also includes aunt/uncle and niece/nephew. So, depending on the age of the outside match, it could be either your uncle's half-...
- 2,599
5
votes
Sharing 52% DNA with mother
The sex chromosomes are likely what make up the discrepancy. I'm guessing you are male.
Females will share exactly 50% of their DNA with each parent, since they inherit 22 autosomes from each parent, ...
- 18.6k
4
votes
Determining if an autosomal and X-DNA match is my half-sibling?
Based on the information provided I belive are only one of two scenarios are possible.
You share a grandparent on your mothers maternal side.
You are half brother's and sisters with the same mother; ...
- 5,541
4
votes
How were the beneficiaries of the 1872 Will of Mary Rogers related?
I'll self-answer, as I've made some progress, although not reached a complete conclusion yet.
I've learned a couple of things along the way, too:
1) Ancestry's default search doesn't work the way ...
- 4,427
4
votes
Is a half-sibling match on AncestryDNA reliable, or is more testing needed?
I had a similar situation with DNA suggesting a half sibling. When looking at shared matches, my half sibling and I shared the same relatives On both of my father’s parents side. No doubt he is my ...
- 41
4
votes
Why would my Full sibling results 99.7% be so close to my half sibling DNA result 99.6% with my sister
Unfortunately, Genex (www.swabtest.com) is not a testing company I am familiar with. They seem to have their own custom tests and custom results without giving you the ability to compare yourself ...
- 16.6k
4
votes
How can 3/4 siblings share mother but not paternal ancestry?
According to the Shared cM Project, the match between half siblings can range from 1317-2312 cM.
Your dad is well within the accepted half-sibling range for both his half-sister and his half-brother.
...
- 2,436
4
votes
Not sharing any centimorgans with person who mother shares 102cM?
You don't share any cM with the man because you have a 50-50 chance of inheriting any given segment from either of your parents. While it's uncommon for a 100+ cM segment total to turn into 0 cM in ...
- 2,436
4
votes
Accepted
What relation is my Half-Aunt to her DNA Matches?
The advantage of more people testing is that you can use the cM ranges better. Here, your aunt matches full siblings with different cM totals, even though they have to be the same relationship to her....
- 2,436
4
votes
Interpreting ethnicity from DNA testing
It means that the Chinese ancestry comes from your paternal grandfather's side, and 50% and 100% are good estimates, but the exact percentages could vary.
Exactly half of your DNA is from your Dad, ...
- 173
4
votes
Is autosomal DNA testing sensitive enough to distinguish non-paternity events many generations ago?
In order to do what you're trying to do with autosomal DNA, with an ancestor that far back, you would need to (a) have an extremely large set of matches to work with, across all the descendant lines, ...
- 2,599
3
votes
Distinguishing half sibling, uncle or half nephew using Ancestry DNA?
According to Blaine Bettinger's Shared cm Project - Version 3.0:
Cluster #2 is: Half Sibling, Aunt/Uncle/Niece/Nephew and Grandparent/Grandchild
Cluster #3 is: 1st Cousin, Half Aunt/Uncle/Niece/...
- 16.6k
3
votes
Shared centimorgans of first cousins with different paternal grandmothers?
Another way you may see this relationship described is "half first cousin", meaning the cousins only share one grandparent.
The Shared cM Project is my go-to source for such information. According to ...
- 18.6k
3
votes
Is it possible to fall below the lowest amount of shared cMs for a half first cousin and still be a half first cousin?
Your paper evidence seems to be fairly conclusive that the two are half second cousins.
The discrepancy to me appears to be your summation of the GEDmatch matches. It shows two segments over 7 cM ...
- 16.6k
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