Questions tagged [dna]

For questions about using DNA to further knowledge of family history, relationships, ethnic origin, and overall ancestry. Most common tests include Y-DNA, mitochondrial DNA, and autosomal DNA.

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25 views

Using AncestryDNA to verify if sister also aunt

My bio dad adopted my sister. We share the same mother. I recently found her birth certificate, and on it was grandfathers name. It was in German so I do not really understand it all. Our mother has ...
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54 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 ...
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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
860 views

How to effectively communicate your tree for DNA Matches in first contact emails?

In genealogy in general there is a lot of ‘cousin hunting’ but in DNA Genealogy where people do not necessarily also have published trees for you to explore but you are reasonably close matches you ...
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161 views

How can you use FamilyTreeDNA's Search tool to contact matches / find contact information?

How can you use FamilyTreeDNA's Search tool to contact matches / find contact information? I have been continually challenged (as described in the challenges below) by trying to figure out how to use ...
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41 views

Is 64.2% / 4776 cM full sibling an outlier?

According to 23andme, my younger brother and I (male) matched 64.2% with 4776 cM. That seemed weird since our matches with our parents are the normal ~50% or just under. This is very much not my field,...
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1answer
61 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 ...
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40 views

Half uncle cM match to niece/nephew not same as reverse match

My mother's half brother and I both submitted DNA samples to Ancestry. His came back 393 cm related to me. Mine came back 795 related to him. Why would there be such a large difference?
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1answer
35 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 ...
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2answers
101 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.
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Deciding between two competing theories - who am I anyway?

My great(5)-grandfather Daniel Cooper arrived in the US around 1695 (maybe he was born here, maybe born at sea), and while his descendants are relatively well documented, nothing is known for sure ...
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2answers
45 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 ...
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27 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 ...
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50 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’...
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32 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 ...
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1answer
4k views

What is considered a strong match on a Big-Y DNA test?

I have done Big-Y on FamilyTreeDNA for a single individual and considering others as well as using the YFull interpretation service without fully understanding how to use it because I wanted to ...
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1answer
886 views

Explaining and interpreting YFull raw data statistics?

YFull displays several statistics about the BAM / Full Genomes sample used to create the YFull report. Unfortunately there is no explanation of what the statistics really mean in terms of impacts on ...
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2answers
84 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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2answers
212 views

Identifying John Morgan, son of Thomas D. Morgan (1809-1870)?

I have a real dilemma. I have found a DNA link to the Thomas Morgan (1791-1860) family through Frances Denira "Fanny" Morgan (1821-1899), daughter of Benjamin Francis Morgan (1762-1835), who was the ...
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64 views

2nd cousin showing up as DNA match

I recently discovered I shared a DNA match with a lady of 341cMs of whom I don’t know. I’ve since made contact with her and some missing gaps discovered. She has a half sibling (1972cm) - brother , (...
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17 views

Father is a twin, closest DNA match is 1,723 CM's [duplicate]

My closest DNA match is 1,723CM's across 32 segments with the longest segment being 217 CM's. My next closest match is a cousin of the first match 886 CM's across 31 segments with the longest being 78 ...
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1answer
294 views

Understanding 1,537cM match to person and 1,950cM match to their uncle

I have a match with a female that is a few years younger than me (she is in the 60s). She and I match at 1,537 cM across 47 segments. Her Uncle (Paternal Uncle, as far as I know) is a match with me ...
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2answers
5k 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?
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2answers
2k views

How can genetic relatives be related to both maternal and paternal sides, but not each other?

I am completely ignorant to all of the genetics of ancestry, although I have a keen interest in family history. I did a DNA test through 23andme, as did my mother and a paternal aunt. In my list of ...
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1answer
690 views

Determining likely relationship based upon autosomal DNA shared cM

Given two tests that share some cM of autosomal DNA, how can I easily find the predicted relationships that such shared cM would suggest? For example, a 2,200 cM match suggests it could be either: ...
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1answer
63 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 ...
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0answers
41 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% ...
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1answer
39 views

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 ...
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1answer
71 views

Why does 23andMe say there's “not enough information” on a few of my chromosomes?

I've been looking at the chromosome painter and my matches in 23andMe, and realised I have a few chunks of DNA that are greyed out and read "not enough information", and therefore don't ...
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1answer
131 views

Interpreting runs of homozygosity data to determine how closely parents were related?

According to Gedmatch's Are your parents related? tool, my grandmother's DNA shows several runs of homozygosity (ROH): Chr Start Location End Location Centimorgans (cM) SNPs 3 180690286 ...
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1answer
208 views

Private DNA Test Results for Half Sibling

I have 2 alleged fathers and have recently ruled out one of them with a private DNA test. I am now trying to determine whether the other is my father but he is deceased, so I am testing with one of ...
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1answer
233 views

Determining if siblings are half siblings or full siblings?

I recently found 6 siblings 4 who are half and 2 who may be full. My sister was born in 1949, I was born in 1950 and my brother in 1952. The other siblings all know who both their parents are. The ...
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1answer
101 views

DNA siblings or cousins

If my mother’s sister and my fathers brother have a have a daughter, how close will her DNA be to mine? Would we be as close as half siblings?
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1answer
277 views

DNA implications if my Gr Grandfather is also my Dad's father? (incest)

I am trying to find my family of origin. My dad died several almost 15 years ago before DNA was a common thing. He was adopted and never knew anything about his birth parents and he never wanted to ...
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2answers
49 views

Identifying paternal grandfather using DNA tests if birth name is unknown

My paternal grandfather was raised by others and took their name, but he was not officially adopted. I have no idea of his real name. Can I still find him/family with DNA test(s) and, if so, which ...
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1answer
36 views

331 cm Uncle - could it be different relative

On 23&me the DNA results came in yesterday and it exactly states "You & John share the DNA that was passed down from two of your grandparents (his parents)". We have 331cm in common ...
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2answers
193 views

Explaining risks when seeking DNA testing by cousin?

It has recently occurred to me that I have been in intermittent contact with a second cousin who shares my father Y-DNA (subject to any mutations in the last two generations, which should be slight). ...
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3answers
147 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 ...
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1answer
2k views

Interpreting results of siblingship test?

My sister and I suspect we have different fathers. We took a siblingship test through DDC. The results are a little confusing and honestly, they put our wet swabs each in a paper envelope and then ...
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1answer
91 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. ...
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1answer
162 views

Understanding shared match of 1,177 cM? [duplicate]

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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6answers
37k 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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2answers
67 views

Y-dna upgrade or SNP pack?

I took the Y-dna12 test first, it came out as J-M67 but I want to proceed to find out my subclade and I can't decide to either get the J2 - M67 & L24 SNP Pack or to upgrade to Y-DNA67. What would ...
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2answers
117 views

Seeking DNA-test for family membership of ancestor 400 years back along paternal lines?

I have foolishly accepted to act as an advisor to my uncle (on my mother's side), and find that I am quite unprepared to do so. He is trying to follow up a family tradition that his x-GF (all on his ...
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1answer
31 views

Can two Paternal Y-DNA Haplogroups still be identical if they are processed on two different 23andMe Chips?

I have a male match on 23andMe that I'm fairly certain is a Paternal match through my Paternal Grandfather. As far as I understand it, I should have a (nearly?) identical Y chromosome to him. ...
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6answers
10k views

Can Ancestry.com DNA matches be wrong

I (female) had an unexpected half sister match (1,866 cM across 49 segments) in Ancestry.com. We are about the same age so I'm assuming sibling. Upon closer examination I realized my brother(A) was ...
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1answer
241 views

Does 23andMe limit matches?

Out of 1500 DNA matches, none are more distant than estimated 5th cousin (15 Centimorgans). Do 23andMe have a 15 Centimorgan cutoff, or a cutoff of the number of matches that is limiting how many ...
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2answers
1k views

Is this adopted DNA match my niece or half sibling?

The adoptee and I have an autosomal total segment of 2138.8 cM the largest segment is 122.6 cM. The X-DNA is 115 total with the largest segment at 95. My son matched the adoptee with autosomal 1124.1 ...
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2answers
155 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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1answer
76 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. ...

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