Questions tagged [autosomal-dna]

For questions about autosomal DNA testing for genealogical purposes. Autosomal DNA is the majority of the DNA in our chromosomes, and is passed by both mother and father to child. This includes tests provided by AncestryDNA, 23andMe, and FamilyTreeDNA's FamilyFinder.

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Can aunt and her nephew's dna trace line to see if aunt's mother (nephew's grandmother) is her biological mother?

My Mom has had her DNA done, and her nephew, her sister's son, had his. There has always been a reason to believe that her mother is not her biological mother and my 89-year-old Mother really wants to ...
teresa's user avatar
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DNA origins on Ancestry

About 6 months ago I had my DNA tested through Ancestry and am currently building my family tree. In my DNA origins it is showing, on my paternal side, that my ancestors 100% originated in East Mayo ...
Elaine's user avatar
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Why/how does Ancestry.com report details of 26 chromosomes?

The second column of Ancestry's DNA results download is the chromosome number: rsid chromosome position allele1 allele2 rs3131972 1 752721 G G But it goes from one to 26! What's up ...
WGroleau's user avatar
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1 vote
2 answers
76 views

Double cousins influence on 1C1R

Working on mystery cousin match who gave me access to her data. She is seeking birth father whose relatives who have tested are our shared matches. Using DNA painter tools and my known relationships, ...
Linda Williams's user avatar
0 votes
1 answer
93 views

Distinguishing mother from sister using autosomal DNA matches

M (female) matches F (female) with 2923 cM half identical (51 segments) and 866 cM (identical) on 37 segments. Longest segment is 184 cM on the X chromosome. Have a 135.04 segment on another ...
Mary's user avatar
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5 votes
2 answers
146 views

Unknown First Cousin Matches

I am matched to 8 or 9 different people who all happen to be first cousins to each other, and who also apparently are all my first cousins. They have between 1032 cm’s all the way down to 785 cm’s and ...
Sandra Crossan's user avatar
1 vote
2 answers
97 views

Niece doesn't share any matches from my paternal side?

My Sister's daughter took a DNA test on Ancestry and matched with me at 1153 CM's 38 Segments at 90cm being the longest. She does not match any of my paternal matches. every match we have in common, ...
Sandra Crossan's user avatar
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51 views

Nearly identical ethnicity inheritance?

I did the testing through Ancestry, and according to the Ethnicity Inheritance graph (the donut), my parents have nearly identical proportions of Scottish (30% 27%), Irish (10% and 9%), and England/...
penguin97's user avatar
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213 views

Can paternal half sisters share only 16% dna?

My mom was adopted and knew nothing about her biological dad. We know her biological mother and her family. I'm looking for her bio dad. We both tested on Ancestry. I tested first, and I did the ...
Anna's user avatar
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4 votes
2 answers
125 views

Do DNA results support theory of 1860s adoption of illegitimate nephew?

I suspect that George Kober, born 12 Feb 1858 at New Haven, CT, was the illegitimate son of Mary Agnes Kober, born 27 July 1839 at Liebelsburg, Calw, Germany. I also suspect that he was adopted by ...
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3 votes
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Is autosomal DNA testing sensitive enough to distinguish non-paternity events many generations ago?

I have been researching my family line for decades, and have run into quite a brick wall with my earliest known progenitor, Daniel Cooper Sr. (1695-1795). There is an oft-repeated story about him ...
Betty Crokker's user avatar
4 votes
1 answer
323 views

Ancestry.com "Common Ancestor" algorithm

Ancestry.com has a feature where it will use all available trees to find a common ancestor for a DNA match. I believe that it looks for overlaps in trees. It has done a good job for many of my matches....
Mattman944's user avatar
1 vote
1 answer
353 views

How to map BAM file from hg38 to hg19 for GEDmatch kit creation?

I have a Whole Genome Sequence (WGS) test from Nebula which results in a hg38 BAM file. I'd like to generate a kit on GEDmatch.com which requires hg19 BAM together with the WGS Extract tool suite to ...
WilliamKF's user avatar
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1st – 2nd Cousin 395 cM | 6% shared DNA Father's side [duplicate]

I've connected with a cousin on ancestry.com and 23andme and dna doesn't lie he is my cousin. however we cannot find out who our common ancestor is. 1st – 2nd Cousin 395 cM | 6% shared DNA Father's ...
DGJ's user avatar
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Thought godmother wasn’t related, but she’s a MATCH?

Close Family – 1st Cousin 24% sharedd DNA: 1,677 cM across 42 segments. I was always under the impression that my godmother was not my relative, but, much to my surprise, the above results came back ...
Sunny's user avatar
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1 answer
78 views

Distinguishing niece from sister using shared percentage DNA [duplicate]

On Ancestry who I thought was my niece my oldest sisters child shared 49% -56% dna how is that possible ? I also have a first cousin who shares 26% yet his sister only shares 6% why is that
Lynell Royston's user avatar
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1 answer
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Determining common ancestor by where descendants match on particular chromosome

Can I tell which ancestor, like a 4th great grandparent by where we match on a particular chromosome? I am trying to find 4th great grandmothers maiden name. I have distant matches with same names ...
user14230's user avatar
1 vote
2 answers
162 views

Autosomal DNA match anomaly or false positive?

I've done autosomal DNA tests on ftdna for myself, my mother and paternal grandmother. I've transferred the results to MyHeritage, where I have a match with a person X with the largest segment of 27cM....
CuriousM's user avatar
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1 answer
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Distinguishing aunt from half sister using X and autosomal DNA [duplicate]

My dad died 4 years ago. But my grandfather (his dad) could be my bio dad. We have made a test with my aunt (his full sister) and we share 25,27% dna (1860,2cM 43 segments max136,2cM) With Geneanet we ...
Cla's user avatar
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Interpreting DNA Match of 947cM at AncestryDNA [duplicate]

I am 75 years old. I have a known 1st cousin who matches 756 cM with me. I also have an unknown 1st-2nd cousin who matches 947 cM with me and is 44 years younger than me. What relation could this 1st-...
Pauline Laws's user avatar
1 vote
1 answer
3k views

Assessing likelihood of incest using AncestryDNA results

My mother was raped by her father sometime in her adolescence. There was a trial and he was acquitted, but it is generally known and accepted in our family that the rape did occur. I don’t know if the ...
user14001's user avatar
0 votes
2 answers
148 views

Determining likely relationship for DNA match of 1,148cM

Was not looking to discover my father wasn't my bio dad. Now I have a match claiming I'm his half- aunt. I'm hoping that I'm NOT his parent’s half-sibling but instead their half-cousin. Is it possible?...
signora giustizia's user avatar
1 vote
0 answers
98 views

Using DNA to find biological father

I have done both 23 & me and Ancestry trying to gets leads on who in the world my birth father could be. My mom truly can’t recall. I found a first cousin or potential great aunt I think. She ...
The Mindful Raven's user avatar
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1 answer
103 views

Making sense of low DNA match for half-siblings

My DNA match on Ancestry was thought to be my half sister. After my test came back, 713 cMs across 20 segments, 10% shared DNA, longest segment 136, that says my Grandfather would be her father, but ...
Neil's user avatar
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1 answer
294 views

How do Genetic Percentages in Common Compare to Possible Familial Relationships?

I recently was contacted about a deceased half-sister who is 11 years older than me. I did a 23AndMe test, and it shows us as 1st cousins with 13.57% shared DNA. An adoption agency lists my mother as ...
Travis's user avatar
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0 votes
1 answer
53 views

Understanding DNA match of 2,559cM to grandparent

I received my DNA results from Ancestry. My first DNA match ended up being my paternal grandpa. We shared 37 percent of our DNA and 2559cm. If that seems high, what could be causing so strong of a ...
Amanda Senn's user avatar
0 votes
1 answer
156 views

DNA matches half uncle

I was wondering if anyone could answer this question I have. I have DNA match with my half uncle ( fathers side) , and I also have a half great Aunty - mother’s side. My sister has a slightly higher ...
Cam 's user avatar
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1 vote
0 answers
38 views

Would half siblings share the same DNA links to extended family

I've matched with either a half sibling\aunt or niece on MyHeritage - we chatted and it seems like we share the same father. However, I have links to a 1st cousin once removed or second cousin, for ...
Sasha Duguid's user avatar
1 vote
1 answer
97 views

3rd Cousin DNA with a person

I share a DNA match with a male person of 152cM coming up as a 3rd cousin. I also share a match with his half brother but much Lower at 45cM. These two share the same father but different mothers. I’...
Cam 's user avatar
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1 vote
0 answers
54 views

What is the relationship based on shared DNA

We are trying to find out information regarding my mothers biological father side of the family. My mom was adopted in 1945 and later in life discovered her biological mother but not her biological ...
Adrian Mahon's user avatar
1 vote
1 answer
317 views

Distinguishing half siblings from first cousins (possible fathers are brothers) using shared cM

Regarding half siblings, sent my DNA to Ancestry came to a match of half sibling at 1530 cMs @ 99% half sibling however was in contact with such match and he is claiming my father or one his two ...
Tony  Lombardo's user avatar
0 votes
2 answers
144 views

Understanding DNA match of 1,723 cM

I have a DNA match of 1,723 cM with a male 6 years younger than me. His father is one of a twin, could my match be not my half-sibling but my 1st cousin.
Lorraine Wingate's user avatar
4 votes
2 answers
7k views

Sharing 52% DNA with mother

I received my 23 and me results and it says I share 52% DNA with my mom. Is this possible?
Anónimo's user avatar
1 vote
1 answer
142 views

Understanding relationship with Shared DNA of 1,501 cM across 50 segments [duplicate]

My husband and I recently did AncestryDNA. He came back with a DNA match (shared with his mother) that simply says "close relative". He has no idea who this person is, and his mother claims ...
Rebecca Pettyjohn's user avatar
1 vote
1 answer
141 views

Half Uncle possibility -fathers side

I recently conducted a DNA test on ancestry.com and I received a strong match with a guy I don’t know . 758cms across 23 segments longest segment 86cm. He is 57 years of age and my father is 70 and i ...
Cam 's user avatar
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1 vote
0 answers
54 views

ALL 23andme matches link via one grandparent?

I have spent hours today looking at my 23andme DNA matches, and while I have not checked every single one, it seems to me that ALL of them descend from ancestors of my paternal grandmother. I am 100% ...
Victoria T's user avatar
0 votes
1 answer
75 views

2 unknown grand fathers

I have known for a long time that my fathers father is unknown. Unfortunately, I have learned that my mothers father is unknown also. I have recently received my DNA results but the nearest match is ...
Staylor70 's user avatar
2 votes
2 answers
240 views

Shared DNA when MRCAs are Cousins

On average, 2nd cousins are expected to share about 1/16 of their DNA. If parent-child share 3600 cM, then the 2nd cousins would share on average 1/16 of that or 225 cM. The 2nd cousins share a set of ...
lkessler's user avatar
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0 votes
1 answer
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Does DNA match of 1,781 cM suggest half siblings? [duplicate]

I have been contacted by someone who says we are half sisters due to our DNA match. Our DNA is 1,781 which apparently is a high match. Would this make us half sisters? I am an only child and she is ...
Mary Ann Arkinstall's user avatar
0 votes
1 answer
38 views

Is 1,147 cM match for half sibling or cousin

I have an 855 cM match with a mystery 1st-2nd cousin. My cousin has an 1,147 cM match to the same mystery cousin. Is it possible the 1,147 cM match could be a half sibling?
Rita's user avatar
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0 votes
1 answer
102 views

Can my half uncle's, half sister be my 1st cousin once removed?

What we believe to be my half-uncle (16% shared DNA | 1,118 cM), has a believed half-sister (1,660cM). My relation to the 'half-sister' is (8% shared DNA | 541 cM) which would most likely make her my ...
Megan Reed's user avatar
3 votes
2 answers
82 views

An Odd Set of cM Match Amounts

I can't resolve why the following strange set of match results is occurring. We have a fairly simple set of known relationships as shown in this tree: All the DNA Testers are shown in green. Jenny ...
lkessler's user avatar
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3 votes
3 answers
283 views

How can two different generations of one family be a half sibling to an outsider?

My full paternal uncle and I enough cM with an outsider to both be listed as half siblings to an unknown male. My uncle shares more cM with that unknown male than I do (a female). Both my uncle and I ...
MOMMAMIA9's user avatar
5 votes
3 answers
154 views

Clustering of DNA regions at the grand-parents level

My father is born of unknown father and did a 23 and me DNA autosomal test. I thought I could use this test to potentially identify some relatives on this side but only very distant ones (at best 3rd ...
C. V.'s user avatar
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0 votes
1 answer
105 views

Full sibling vs half sibling

Initially one of my full siblings and I received dna results from ancestry.com. which showed that our shared dna is 1752cm, and we were matched under close family - 1st cousin. I was a little ...
molly andrews's user avatar
2 votes
2 answers
199 views

23andme shows a man as my dad's cousin, but ancestry.com shows him as my dad's brother

I did 23andme, and so did our mystery man. Two of my grandfather's brothers also did 23andme, as well as a number of the kids and grandkids of my grandfather's brothers and sisters (my grandfather ...
anna porter's user avatar
0 votes
1 answer
140 views

DNA half-sibling

My brother did an Ancestry DNA test last year and last week got notification of a new close relative match. The man matches at 1695cM which indicates grandparent/grandchild/uncle/nephew/half-sibling. ...
SQ1903's user avatar
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0 votes
1 answer
163 views

What is the cut off for a half-sibling and first cousin in CM's?

I am adopted and was searching for my birth family and found a cousin and since then I had someone in the family helping me with the search. I found someone who I think is my half-sibling. She did a ...
Marsh's user avatar
  • 1
0 votes
1 answer
138 views

Trying to narrow down biological grandfather

I have been working on finding my biological grandfather. The closest DNA match I have to my father (who has taken a test) is 1015cM. I've narrowed down his father to either her father or her uncle. ...
user avatar
1 vote
1 answer
639 views

What would the cM range be for persons sharing the same mother and the fathers are brothers?

I had a swab test performed to establish sibling-ship through DNA Diagnostic Center (DDC) wanting to confirm what I thought was certain paternity with myself, male sibling and and mother (father ...
Desparete For Assistance's user avatar

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