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 ...
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  • 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 ...
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  • 24k
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 ...
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7 votes
Accepted

Inferring father/son relationships from Senior (Sr.) / Junior (Jr.) naming?

In the colonial period, language usage for kinship terms (and other terms) was not necessarily the same as it is today. Several of the 'how to' books I've read have said that in the colonial period, '...
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  • 24k
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 ...
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  • 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 ...
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  • 1,860
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 ...
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  • 18.5k
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 ...
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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)...
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  • 250
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 ...
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  • 5,122
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 ...
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  • 5,237
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 ...
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  • 18.5k
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 ...
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  • 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 ...
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  • 18.5k
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 ...
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  • 11k
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....
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  • 16.5k
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 ...
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  • 16.5k
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-...
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  • 2,484
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, ...
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  • 18.5k
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 ...
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  • 4,417
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; ...
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  • 5,521
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 ...
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  • 16.5k
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 ...
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  • 41
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. ...
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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 ...
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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....
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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, ...
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  • 173
4 votes

Understanding why first cousins may share only 360 cM

This website presents information from a simulation study of first cousin DNA matches done by an expert statistician, Philip Gammon. https://dna-explained.com/2017/09/27/first-cousin-match-simulations/...
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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/...
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  • 16.5k
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 ...
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  • 18.5k

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