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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3
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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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0answers
34 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
60 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 ...
2
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1answer
57 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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1answer
28 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 ...
3
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1answer
64 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 ...
2
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1answer
142 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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1answer
34 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
38 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 ...
3
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3answers
112 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 ...
2
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2answers
41 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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1answer
159 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 ...
2
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1answer
27 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. ...
2
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2answers
101 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 ...
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1answer
64 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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1answer
45 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 ...
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1answer
86 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. ...
2
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2answers
130 views

Do two halves make a whole?

Jack has a half brother. Jill has that same half brother. Jack and Jill are not related. Jack and Jill have a child. The brother becomes the half uncle to the child on his brothers side and on his ...
1
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1answer
80 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 ...
2
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1answer
71 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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1answer
63 views

Understanding half sibling test report

I had requested DNA analysis of my half sibling and have received the results. But unfortunately I am confused with results of the conclusion, meaning the conclusion which is in bold and the sentence ...
2
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0answers
123 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 ...
2
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0answers
38 views

Determining parent ethnicity

My father and I both took Ancestry.com DNA tests. His came back 100% European Jewish, while mine came back 37% Italian and 63% European Jewish. Does this most likely mean my mom is 26% European Jewish?...
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2answers
75 views

Is my match a first cousin or half sister?

My brother and I show up as full siblings (2310cM shared). He shows up to cousin #1 (thru our mother) 976cM shared and cousin #2 (thru our father) 813Cm shared. However, I share with cousin #1 920cM (...
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3answers
126 views

Is there anything wrong with using small DNA segment matches as evidence?

Many people find relationships with other people that they only share a small amount of DNA with, e.g., 10 cM or less. They then, after researching the other person's tree, find a common ancestor and ...
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0answers
58 views

Can niece not connect to my paternal line but her daughter connects to my maternal and paternal side?

My niece is a dna match 2112 cM over 80 segments. She only matches on my maternal side of the family. Her daughter is a dna match of 1118 cM over 46 segments. She matches both my maternal and paternal ...
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1answer
69 views

DNA Second cousin

My husband recently discovered that he is 52% European Jewish through an Ancestry test. He matched with a female second cousin that is 100% European Jewish. Is there a way to know which side (mother ...
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0answers
38 views

How is it possible to have an X-DNA/X-Match match on my father's side as a male myself?

On FamilyTree DNA, I have a match who is very clearly from my paternal grandfather's side. I am a male myself and thought it was only possible to have X-DNA matches on my mother's side. I thought my ...
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1answer
84 views

DNA vs Family Tree

I recently got a DNA match for my wife and it was suggested that this man is a 1st cousin once removed or 2nd cousin. When I pursued that branch of the tree to confirm the match, it seems they are ...
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0answers
46 views

Birth Record Missing: Joseph C. (POLEO) O'BRIEN 1921 - 1981

My project invlolves finding the proof of birth for: Joseph C. (POLEO) O'BRIEN (born, orphaned, adopted?) Apparent info (not certain) is: BIRTH 05 JUN 1921 • Brooklyn, Kings, New York, USA DEATH 11 ...
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0answers
49 views

Why would my cousin's son not show up as a DNA match with me, yet we both show a DNA match to a distant relative on that same side?

I recently did a DNA test thru 23andMe as did my half-brother (my father's son from a previous marriage). It showed up as ZERO DNA shared, which baffled me as he looks just like my father and his ...
4
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1answer
66 views

Benefit of Y-DNA testing self vs father or grandfather?

I am planning on taking a Y-DNA test. As a male myself, if there is an option to test my father or paternal grandfather instead, would there be any practical benefit? I am not inclined to test more ...
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0answers
23 views

Adoptee's Birthfather was also adopted and I have found a second cousin on my fathers side Trying to track down my Birthfathers Parents

I was adopted and have my Birthmothers info But my Birthfather was adopted and thru Ancestry DNA I found a Second Cousin
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0answers
56 views

My close family dna match

On ancestry.com my first to second cousin match is my supposed first cousin but him and I share 841 CM across 46 segments is he my cousin or my half nephew and do I possibly have a half sibling?
2
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1answer
64 views

Changed Birth Certificate number

The certificate number on my grandfather's birth certificate from 1893 was changed. You can see the original, crossed out number just above the new number. When he passed, and the family found his ...
2
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0answers
298 views

Incest and Shared CentiMorgan Theory. Half/Full Sibling and a Single Transverse Palmar Crease

My female ‘half sibling?’ and I, also female, share 2,129 cM. We DO NOT share the same father. DNA testing revealed that conclusively. Ancestry puts us into Close Family/1st Cousin. DNA painter ...
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1answer
71 views

9 of my top 11 DNA matches (three generations) show the category of 1st -2nd cousin

I am trying to find my biological father. I believe he is one of 5 brothers and am ALMOST sure of which one. My top 11 DNA matches (all relatives of those 5 brothers) state 1st - 2nd Cousin, however,...
2
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1answer
85 views

How many STRs should I test for medieval genealogy?

I have been researching my Maltese paternal line for a long time now, and fortunately due to one of my distant ancestors being upper class, my genealogy is well documented up until the around 1490, ...
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0answers
95 views

Triangulation in DNA, weird match!

I thought I had grasped the meaning of triangulation. Until I saw this match in MyHeritage (see below). What is happening? It looks like the two segments that have the triangulated match are single ...
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1answer
98 views

Confusing DNA Ancestry

On my DNA results page I'm showing a close family member (1,683cM w/52 segments) and a 1st cousin (914cM w/44 segments.) The close family member share the same last name as a 2nd cousin (449 cM w/13 ...
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2answers
100 views

Do father and mother pass on same DNA to half siblings?

I grew up in a household with half siblings. Same mother different fathers. I grew up never knowing who my dad was. As I got older I started to ask questions. My mother would push back with resistance....
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2answers
98 views

Explaining older sister sharing 1,961 cM as close family or 1st cousin

My older sister came back "close family-first cousin". What does this mean? Shared DNA 1961 cM across 74 segments
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1answer
130 views

Matching less than 6cM on Ancestry but almost 15cM at GEDmatch

I am communicating with someone who appears to be a 5th cousin once removed. According to AncestryDNA my cousin shares 10cM across 1 segment with my paternal uncle, but is not a match to me (at least ...
0
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1answer
60 views

Can 1,782 cM shared indicate Half Siblings? [duplicate]

Could a person with 1,782 cM actually be my half-sibling? This person is listed as close family to me, yet I do not know them. My cM is the same as this person's. I do have 6 paternal half ...
3
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1answer
48 views

How can WGS be done on a bone marrow transplant recipient?

Most of the testing companies use a saliva sample that contains white blood cells for doing Whole Genome Sequencing (WGS) of your DNA. White blood cells are created by your bone marrow, so if you get ...
2
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1answer
541 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 ...
1
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1answer
224 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
165 views

Can a DNA match of 1967cM across 72 segments be a first cousin?

My husband had DNA testing through Ancestry. A woman of about the same age shares 973 cM across 45 segments. We determined that she was probably a first cousin; a child of my husband’s paternal ...
2
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1answer
78 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 ...
2
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0answers
47 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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