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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1answer
455 views

Calculating the relationship from the RAW autosomal result file between two individuals?

My question is about the Ancestry Genealogy tests (Autosomal DNA tests) being offered. Suppose a consume DNA testing service company, like 23andMe/Ancestry.com/FamilyTreeDNA, extracts two people's ...
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1answer
99 views

Calculating segment cM from 23andMe matches?

Going through my list of matches I'm working on a triangulation analysis. (Such that if person A matches from position 10-15 and person B matches from position 10-13 I can break out position 10-13=A&...
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1answer
2k views

Shared centimorgans of second cousins with different paternal grandfathers?

I'm new. Just reading the useful answer to a question about shared centimorgans of first cousins with different paternal grandmothers. I share 238 cM with a second cousin. We can be pretty sure that ...
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1answer
679 views

Centimorgans and relationship

If two people share 327 centimorgans and 19 DNA segments and are first cousins 1x removed, is it possible that one of them is my 2nd cousin 1x removed if we share 353 centimorgans and 17 DNA segments. ...
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0answers
92 views

Looking for 3rd cousins among 4th cousin matches

So I was wondering if its possible in any way to get a hint if someone showing as a 4th cousin match could be a 3rd cousin? From my understanding you can't, but I want to ask if anyone has done this ...
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2answers
324 views

Determining if half brother was product of incest

I have worked on my tree through Ancestry.com for many years to include furnishing my DNA. My brother's daughter started a tree through Ancestry and gave her DNA also; the results shows her as my half ...
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3answers
31k views

Possible half-sibling based on matching Centimorgans

I have been using Ancestry.com for years. A year back I submitted my DNA test. I have had quite a few matches that land in the distant relative to 3rd or 2nd cousin range. Recently, I was notified ...
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2answers
2k views

How much DNA would match a 5th cousin once removed?

I have 5 autosomal DNA tests (from cousins and siblings of each other) that are theoretically all 5th cousins, once removed, from another DNA test. Using GED Match autosomal compare, I found these ...
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1answer
110 views

How do descendants of twins affect DNA matching?

With respect to AncestryDNA matching. Could a child of an identical twin match a first cousin at a half sibling range? My friend has suspected her grandfather isn't her biological grandfather. DNA is ...
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2answers
570 views

My Full DNA: Whole Genome Sequencing with mtDNA from dante labs

I have done 23andme. And I see there is a 23andme tag and an Ancestry.com tag. I have just come across an ad from Dante Labs for "My Full DNA: Whole Genome Sequencing with mtDNA." While I have a PhD ...
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2answers
161 views

How can overlapping ~35 cM segments of matching kits not match each other?

How can overlapping 36.8937 cM (from 11,551,254 to 48,458,402) and 82.9541 cM (from 12,460,601 to 74,135,725) matches on Chromosome 18 not match each other? On GEDmatch, I compare Alice to Bob and ...
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4answers
8k views

Could a first/second cousin DNA match actually be my half brother?

I was adopted at birth and know very little identifying information about my birth parents. I recently took a DNA test on Ancestry.com and found a match that was a possible 1st/2nd cousin match. ...
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3answers
1k views

Is this Match a Half Niece or a Second Cousin?

A DNA match for a woman has shown up on my Ancestry DNA as a second cousin with 490 cM. I recently discovered that I am thought to be the half sister of this woman's mother. My full sister shares 446 ...
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1answer
1k views

Finding my Great-Grandfather when DNA test not conclusive?

I am from Japan and I have been trying to identify my great-grandfather who was British. For more background these are two questions that I have asked here previously: Finding UK record(s) of ...
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1answer
66 views

Is further testing needed to determine half sibling?

On a DNA match I have a 'close relative' that came up matching 2039 Cms across 58 segments. Do we need to do more testing to determine if we are definitively half siblings?
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2answers
587 views

53 Segments of DNA

I share 53 segments of DNA with a relative. I’m currently not sure of my exact relationship with them however, but Ancestry.com shows us as cousins with confidence being extremely high. This person is ...
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1answer
171 views

Matching unknown family member apparent from AncestryDNA?

I had my DNA test done on Ancestry, when I received my results I showed a 1051 CM match to a Sandra. I knew nothing of this person nor could we find any connection. This person lives in Wales. Rumor ...
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1answer
88 views

Mapping DNA relationships on paper

I have recently started digging into my DNA matches. I have several closely related matches. I was born in Montana and my grandma was married to a man who has no biological relationship to me. However ...
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2answers
245 views

AncestryDNA is changing again? What's going on? (July 2020 edition)

AncestryDNA is changing the way they match users, and which matches will be shown to you. Matches that share 6 to 7.9 cM will be eliminated. In addition, since AncestryDNA rounds up segments from 7.5 ...
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2answers
141 views

Understanding shared DNA of 1,576 cM with great nephew

I had my DNA tested through Ancestry. About a year ago, my great nephew (I'll call him GN-1) whom I raised had his tested. The match came up Close Family–1st Cousin Shared DNA: 1,576 cM across 69 ...
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1answer
117 views

Are centimorgan contributions additive?

I share a 50 centimorgan 6 segment match to person "J". My maternal side aunt shares 54 centimorgan 5 segment match to that same person "J" I see two possible blood-line connections between my aunt ...
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2answers
95 views

Distinguishing relationships based on DNA numbers and age difference?

I recently joined Ancestry and received several first to second cousin matches, all from what appears to be the same family. The strongest match is 1070 centimorgams and 45 segments. This woman is ...
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1answer
687 views

High match on autosomal DNA, but no X DNA match to mother's half sister

The son of my wife's half-sister recently uploaded his DNA (from Ancestry) to GEDmatch where my wife's DNA (from 23andme) is already recorded. There was a high (846cm) autosomal match, but ZERO match ...
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1answer
2k views

What would the starting shared cM number be for abnormally close relationships in Autosomal DNA test?

I have seen in the examination of family trees where individuals sharing a great grand parent marry and have children, somewhat commonly in pre-American Civil War, which I would think would create ...
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2answers
119 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 ...
2
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1answer
160 views

Evaluating half sibling using AncestryDNA? [duplicate]

Recently we (two full sisters and a full brother) think we may have found a half brother who is 50 years old on Ancestry DNA, where he is being categorized as Close Family-First Cousin. sister 52yr ...
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3answers
258 views

Determining if 1,814cM match from AncestryDNA is Half Sibling?

My son recently had a match come up as close family the match is male and 1814cm. His only living grandfather is already in our tree at 1857cm. All other grandparents are deceased and have never ...
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1answer
160 views

Interpreting MyHeritage DNA Match of 973cM?

I just got a DNA match at MyHeritage with 973 cM, in common, which says first cousin. My mother had one brother, and it's from her side of the family. He had a son, who passed at a young age. I am ...
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1answer
364 views

Is a 12 CM 1 segment match better evidence for a common ancestor if it's otherwise unlikely?

Early in my research, I had guessed that the Samuel Price listed in the 1850 census for Minersville, Schuylkill County, Pennsylvania (my gg-grandfather's brother) was the same person as Samuel Price ...
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2answers
166 views

Understanding second cousin predictions from AncestryDNA?

I have three extremely high second cousin predictions from my father's side. I do not know my anything about my biological father (Name, age, etc..). My top matches are: R - 619 cM across 39 ...
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2answers
421 views

Confirming possible half sibling from AncestryDNA?

It took a few months to process this shocking news from my dna results from ancestry. I am a new at this & did the test with my daughter for fun. Imagine my surprise when someone contacted me ...
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2answers
2k views

Is DNA match 1st cousin or niece?

I have recently learned that my father is not my biological father. Please see the Ancestry DNA screenshot. The first person in red is listed as a first cousin but I know for a fact she is actually ...
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2answers
105 views

Confirming a connection

Ancestry connected me with 2 people that are siblings, (Unknown to me) .Our DNA match between me and the other 2 is 850 and 971 CM respectively. They are 10 and 20 years older than me as well. Based ...
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3answers
417 views

Sharing more autosomal DNA with second cousin's child than with second cousin?

In my shared matches on AncestryDNA I am used to seeing matches to the children of my 2nd cousins that are less than the match I am to their parents. However, when examining my sister's DNA I see ...
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1answer
279 views

Why might number of Shared Ancestor Hints go down on AncestryDNA?

I only received my AncestryDNA results a few weeks ago, and so I am still learning about its functionality. One of the options that I find the most useful is its Shared Ancestor Hints because these ...
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2answers
191 views

Why do I only share 360 Centimorgans with my 1st cousin?

I have taken a closer look at the info on my 23andMe match with my known 1st cousin. It says we share 360 Centimorgans, and the Centimorgan charts I've looked at suggest this is potentially outside ...
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1answer
698 views

Child of possible incest

My sisters, two aunts and several cousins (on maternal side) did the 23 and me DNA test. One of my aunts (the younger one) showed up as a half sister to me (we share 1,942 cM and 44 segments) and my ...
2
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1answer
80 views

X-DNA and Half Sister

I am a female. Another female and I have come up as sharing 1915 cM's and when we do the one to one X-DNA on GED Match, if we click on "prevent hard breaks", we have a straight blue line across the ...
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1answer
223 views

Can 419 and 468 shared cM indicate first cousins? [duplicate]

I was adopted and have known my birth family for many years. I just did a DNA test and found I have 702 matching cM's with the daughter of my mother's brother (making her my 1st cousin). This helps ...
2
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1answer
143 views

Possible family relationship with 3rd cousins

I have three 3rd cousins on my mother's side with 66.1-71 cM shared between us. One is male and 2 female. These 3 cousins are 2nd cousins to each other and I believe I am their third cousin. They ...
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1answer
2k views

Distinguishing half sibling from niece/nephew using AncestryDNA?

I did the ancestry DNA test and also uploaded my raw data to GEDmatch. I have located two close family matches and I'm wondering how to find out how close we are. Either half siblings or niece/nephew. ...
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2answers
139 views

Can Origin of Spanish DNA from 16th to 18th generations be traced to historical events?

DNA on Ancestry & GEDMatch -- I find a bit of Spanish with a dash of some Mediterranean groups all dated to 16 or so generations back. Else all British Isles with another dash of Northern ...
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1answer
2k views

How do I determine our common ancestor?

I'm trying to find a match for DNA that is narrowed down to go through my dad's line and another person's paternal line. I'm thinking if I could compare our fathers' pedigree surnames it might reveal ...
2
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2answers
85 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 ...
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0answers
49 views

Have I found both biological parents, one biological parent or should I keep looking?

My husband's mother was adopted without any records (1910 NYC). I located her biological paternal family along with several possible brothers through DNA. I cannot locate her biological maternal ...
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0answers
40 views

Using Collaborator status of AncestryDNA to see tree owner's shared matches to one of their matches?

At AncestryDNA, about two months ago, my sister set me as a Collaborator on her DNA test which is linked to my tree, and I just checked to see that I still have that Collaborator status, and as far as ...
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0answers
739 views

Is the relationship an aunt /niece or half sister to my mother?

I am a genetics beginner: A little back story: My mother was adopted at birth. She found her birth mother and siblings back in the 90s. The birth mother was deceased at the time, and we also ...
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0answers
349 views

Autosomal DNA Chromsome Browser - Is there such a thing as a 'family trait' of shared segments?

I realize the passing of genes is approximately 50/50 (reference Generational Loss of Data with DNA testing) with each generation and which genes are passed are commonly referred to as 'random' based ...
2
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1answer
161 views

Understanding daughter's 314 centimorgans with half nephew

My daughter just learned she shared 314 centimorgans with a boy we believed was her half brothers son. I have just sent in my sample as the supposed father of her 50 year old half brother. We are all ...
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1answer
408 views

Why no DNA match with possible seventh cousin?

Working on my geneology family tree I discovered my 6th generation grandfather link with another person. I had a DNA test and no match came back with the other person who also had DNA test and I have ...