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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23 views

Understanding cM?

I recently received a "DNA Match" on my account to some one who shows 1,177 cM shared. I am trying to understand what this is really telling me. This is important to me as I do not know who my ...
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32 views

Understanding shared centimorgans?

I took an AncestryDNA test and have matched with a new relative JP. She and I share 1836cM. She’s not my half sister. She’s not my grandparent. She could be my father’s half sister. With this amount ...
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37 views

Does age factor in when calculating relationship on DNA match

A result of 193 cm from 100 year old, matched up to a 35 yo. Does the age of the participants factor in? The sample also showed cross match. The relationship is estimated at 2nd to 3rd cousins. Does ...
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7k views

Distinguishing half sibling, uncle or half nephew using Ancestry DNA?

My husband did ancestry dna to find any info on his biological fathers side. He just got a “close family” match with whom they share 1440 cM across 49 segments. Is it possible to be a half sibling?...
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Does 1,517 shared cM indicate half-siblings? [duplicate]

My husband has a close family match of 1,517cM across 61 segments and his niece shares 906 cM across 40 segments. Is there a chance this is a half brother to my husband and half uncle to his niece? ...
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78 views

Is AncestryDNA match of 1,655 cM a half sibling?

Shared DNA: 1,655 cM across 46 segments. Can someone that shows this as one of my matches on AncestryDNA be a half sibling?
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1answer
116 views

Is AncestryDNA match of 2,063 cM a half sibling?

I am new to AncestryDNA and my results came back with my top match having 2,063 centimorgans out of 62 segments saying close family. Would this be a half-sibling? The match is a few years older ...
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2answers
521 views

Does 1,366 shared cM indicate half-siblings?

I recently did Ancesty DNA to determine a match between me and a possible half sister. The results came back, and we share 1,366 cM of DNA. As I’ve learned, this is on the low side for half siblings ...
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21 views

cM's for a 2nd cousin?

I'll try to keep this simple. I was adopted and have known my birth family for many years. Just did a DNA test and found I have 702 matching cM's with the daughter of my mothers brother (making her ...
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16 views

Does 1,427 shared cM indicate half-siblings? [duplicate]

I share 1427cm 54 segments with a close family to 1st cousins with a probability of 93.7% to grandparent, aunt uncle or half sibling. All of my info is that he is related on my maternal side, ...
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51 views

Does sharing 1,249cM indicate half sibling?

My husband was raised by his older half brother. We have been told throughout the years that he is actually my husband father.We ran an ancestry test with his daughter. Results were sharing 1249cm ...
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1answer
94 views

Understanding double cousins?

I’ve been trying to find out the identity of my grandfather for quite some time and recently, new DNA matches have meant it easier for me to narrow it down. I have 3 matches that are all descendants ...
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1answer
50 views

Identical twins DNA numbers (centiMorgans/cMs)

Are identical twins DNA numbers (centiMorgans/cMs) less from grandparents because they are identical twins?
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1answer
34 views

Does match sharing 952 cM indicate grandparent or great uncle?

My mother was adopted and we are trying to find the parents. I have a DNA match that is 952cM and 38 DNA segments. What is the chance of this being my grandparent? It says 1st cousin and we know ...
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1answer
62 views

Distinguishing grandparent from uncle for 1,768 cM match?

Ancestry DNA says: Predicted relationship: Close Family–1st Cousin Shared DNA: 1,768 cM across 68 segments But how does it distinguish between an uncle and a grandparent? It appears that the ...
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59 views

Placing adoptee in family tree when What Are The Odds cannot help?

I am trying to figure out where an adoptee fits in my family tree. I know he are is related on his paternal side, since his maternal side has been identified and is not related to my family. I have ...
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1answer
54 views

Ancestors missing from ThruLines?

At AncestryDNA, until a few days or so ago, all my expected direct ancestors were listed correctly by ThruLines. Now when I look at them some of them have gone missing. For example, today I can only ...
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107 views

Stacking DNA and trees?

I would like to combine information from my trees at Ancestry and MyHeritage and my family members' DNA kits. Is there a software program I can download that will let me input everything? I need the ...
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3answers
20k 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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1answer
49 views

Using AncestryDNA to work out whether mother or father is parent of half sibling?

How do I work out from viewing my shared matches on AncestryDNA which one of my parents is the parent of my half sibling?
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1answer
83 views

Family Networks at Living DNA tells me to Keep Fishing?

Late last year (8 months ago) I accepted an offer via FindMyPast to upload my AncestryDNA results to Living DNA. Three months later I followed the instructions in an email from Living DNA to opt-into ...
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4answers
747 views

Can half siblings share no common DNA?

My half sister and I share the same father, but different mothers. Because my paternity was questionable we both did an Ancestry DNA test....I matched to relatives of my grandmother and she didn't.......
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2answers
85 views

Does 1,864 centimorgans indicate half-siblings?

My sister, daughter and I all took DNA tests for fun. My sister and I show up on Ancestry as "close family," and share 1864 Centimorgans, and we do not share any relatives that my daughter and I share ...
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3answers
4k views

Determining if an autosomal and X-DNA match is my half-sibling?

I am adopted and have info on my maternal side, but not paternal. I recently got a match through AncestryDNA with someone saying we were close relatives. This man and I share 2086 centiMorgans in ...
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6answers
35k views

Is a half-sibling match on AncestryDNA reliable, or is more testing needed?

I'm new at the DNA testing but here are my results. After receiving my DNA results in January 2016 my first match was with a known cousin who is also on Ancestry with a score of 959 centimorgans at 41 ...
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71 views

Does 1,845cM shared indicate possible half sibling?

I was adopted in 1958 when I was 14 months old. I have finally found my birth mother and also that I had 2 half-brothers. They told me that mom had had another baby when that she gave up for ...
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15 views

Does 1,957 centimorgans indicate half-siblings? [duplicate]

I have recently had a DNA test and have a shared match of 1957 over 50 segments with one of the matches. They are not interested at the moment in communicating. I was brought up as an only child, so ...
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3answers
6k 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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1answer
72 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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4answers
23k views

Finding haplogroup through raw DNA data?

I just got my results from AncestryDNA. What are some ways to find my haplogroup through my raw DNA data?
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1answer
37 views

Question on 1/2 sibling versus 1st cousin

A lady showed up in my DNA I think they are the same person. The first one showed up as 1,942 centimorgans shared across 72 DNA segments. The 2nd one says 936 centimorgans shared across 36 DNA ...
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1answer
62 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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78 views

Half siblings or double cousins?

MB= my brother (1/2 sibling) MC=cousin (our mother's sister's daughter given up for adoption-no longer married to SS) DC=cousin to both of us but either 1/2 sibling to my brother or double cousin) AS= ...
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1answer
105 views

Visualising genetic distance information from personal genetics sites

I've been using 23andme.com it shows me a comparison with genetic relatives and lists our common relatives. I have over 1000 3rd, 4th and distant cousins on 23andme. Is there are way to make a ...
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3answers
88 views

Contacting AncestryDNA match?

I have a match on Ancestry.com with someone who I believe is a nephew who was given up for adoption. I sent 3 messages through Ancestry.com but no response. Do you know of any other way to contact ...
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1answer
274 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 ...
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2answers
7k views

Predicted percentages of shared DNA for DNA tests of half-siblings?

My half brother and I each had an Ancestry DNA test. I am female. We share a biological father. Different mothers. Test results show he is my 1st cousin. I am confused. Can you please help me to ...
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1answer
115 views

How can 3/4 siblings share mother but not paternal ancestry?

My family is running the DNA test gauntlet and my dad got back some interesting results. He is related to his half sister (1,687 cM across 66 segments) at a level that is to be expected. He is ...
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3answers
21k views

How to interpret a reasonable X DNA Match, but no shared cM Autosomal result on GEDMatch?

I recently uploaded one of the Autosomal DNA results I manage to GEDMatch.com and ran the X-Match routine and came up with a puzzling result. The strongest result by far on the test has 37.2 shared ...
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1answer
44 views

Creating a phased DNA kit using grandparents' kits?

I was lucky in that I was able to DNA test both paternal grandparents, as well as my maternal grandmother before she died last year. I have also tested my mother, but unfortunately my other ...
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1answer
45 views

Understanding half first cousin DNA results when no match?

We have strong reason to believe we know who my aunt's half first cousin is. However, he is not matching her with autosomnal dna test on ancestry. Its fair to say ok forget it but there are so many ...
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1answer
96 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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36 views

Combining sibling DNA data for easier research

I have DNA from four of my siblings (they were tested at three different places). I'd like to find a way of easily combining our raw DNA data into two files -- even if the files weren't sorted by our ...
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1answer
53 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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2answers
68 views

Are AncestryDNA matches of 904 to 1,211 cM likely to indicate half siblings?

Grandma is showing dna matches with four “1st cousins” who are all supposedly first cousins themselves. The matches are 1211, 1175, 1138, and 904 cms. There is also a match of 972 who is a brother to ...
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1answer
246 views

Understanding AncestryDNA match of 1,866 cM if not Half Sibling?

I have somewhat recently started using Ancestry.com, so just a fair warning that I'm still learning how everything works! That being said, I am the child of my biological mother, who I know, and an ...
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11 views

Possible Half Siblings? [duplicate]

Recently I was contacted by a man who feels we could be half siblings. He explained where his father had lived and I learned he and my mom had dated. My CM to his was over 2000 and ancestry.com showed ...
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1answer
101 views

Distinguishing half siblings from cousins using AncestryDNA?

My husband recently took an AncestryDNA test to see if he could find out who his father was, at least through matches. His closest match that came up was a female who shares 1390 cms across 45 ...
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1answer
73 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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1answer
54 views

Half-Sister/1st Cousin Shared DNA

I'm curious to know what the shared DNA would be between half-sisters who are also first cousins. If the mother of both sisters had an affair with one of the sister's father's brothers what would the ...