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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If my moms half sister has a child with my paternal grandfather what would be the relationship in centimorgans?

My moms half sister had a son with my father's father(paternal grandfather), so their child is my half cousin and half uncle but is showing a DNA match as a first cousin sharing only 1151 cM... is ...
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56 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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22 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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73 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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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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38 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 ...
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1answer
54 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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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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45 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?
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1answer
59 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 ...
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79 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
52 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,...
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1answer
77 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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77 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
76 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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91 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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79 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
86 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 ...
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1answer
57 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 ...
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1answer
44 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 ...
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1answer
231 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 ...
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1answer
116 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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90 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 ...
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58 views

Understanding Ancestry DNA match of 1,668 cM [closed]

Can someone help me to understand an Ancestry DNA match of 1,668 centimorgans shared across 52 DNA segment?
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1answer
57 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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44 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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2answers
62 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
59 views

Might 3.46% American Native DNA come from 10 generations back?

If DNA shows 3.46% American Native, then how far back in generations did it come from? I am told it was from a 10 generations back.
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1answer
54 views

Does 439 cM shared suggest half uncle rather than half first cousin?

I am trying to determine if my half sister had a different father than the one she grew up with. I was given a name of who the father could be. He has passed away but his son took a DNA test on ...
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1answer
107 views

DNA.Land vs AncestryDNA

I received results back from DNA.Land. Northwest European Includes: Scottish Argyll_Bute_GBR and British in England; Icelandic in Iceland; Norwegian in Norway and Orcadian in Orkney Islands Does not ...
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1answer
73 views

False-Positives in Autosomal DNA Matches

I have spent a significant amount of time and effort beating my head on brickwalls that appear when tracking Ancestry Autosomal DNA matches. I've had success in establishing document trails with ...
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2answers
102 views

Intrepretation of DNA detectable relationships

While quite a number of questions have been asked and answered regarding DNA and relationships, I'm not certain that this question has been asked. I have a 5th cousin that has been identified by ...
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45 views

R1a backbone SNP pack worth it?

I upgraded to Y-67 and my haplogroup stayed the same (R-M198). Would it be worth it to purchase the R1a backbone SNP Pack to get a more specific haplogroup? I currently can't afford Big-Y. I ...
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1answer
68 views

Does 866 cM shared suggest half aunt rather than aunt?

There is a joke in my family that my father's father is not his biological father. He only has sisters and his father is dead, so there's no possibility of a true test. But I'm his daughter and I did ...
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1answer
59 views

How does Rutger Map interpolate base pairs (bp)?

I'm trying to use the Rutger's Map Interpolater to calculate the centiMorgan for a specific base pair (bp). How does the interpolater interpolate? So for example I am interested in finding the cM ...
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1answer
78 views

Evaluating half sibling using AncestryDNA?

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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1answer
69 views

DNA/Half-Sibling or First Cousin, Based on Fairly High Shared cMs

Brand new at this and don't have good grip yet on cMs ranges for relationships, especially when number falls in between stated ranges for relationships. Both my dad and I have taken DNA tests from 23 ...
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1answer
40 views

Understanding first cousin and grandson/grandfather relationships at 23andMe

I have 2 first cousin matches on 23andme.. both named ‘John’. Their relationship is listed as grandson/grandfather. With that age difference and relationship they both cannot be my cousin. I’m adopted ...
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3answers
100 views

Half Siblings and DNA Matching

My sister and I are half-siblings. We have always know this and my mother reportedly had an affair during WW2. This was confirmed with ancestry DNA as we only share 1603cM. I'm trying to filter out ...
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326 views

Finding maternal grandfather

All names in the description below have been changed. My mother is going through a crisis because she is afraid my grandfather is not her biological father. She has been diagnosed with type 2 ...
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1answer
62 views

2nd cousins. One 4%, one 8%?

I’ve recently been matched to two second cousins by DNA. However one shows a 4% match and the other one shows an 8% match. One is on my father’s side and one is on my mother’s side. Why, or how is ...
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2answers
149 views

Finding maternal grandfather using AncestryDNA and GEDmatch

I have my DNA and my mom's DNA on Ancestry and Gedmatch. My mom was adopted. I got her original birth certificate from Kansas and found her birth mom's family (birth mom was deceased) but the man ...
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3answers
517 views

Convert tellmeGen DNA file to FTDNA file or similar to upload it

I have a DNA file from tellmeGen and was wondering whether I can convert the file to an ancestryDNA, FTDNA, MyHeritage or similar file format in order to upload it to myHeritage, FTDNA or DNA.Land for ...
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1answer
57 views

Analysing relationships using autosomal DNA

I (A) am 1095 cm's from a known cousin (M). I (A) am 1224 cm's from an unknown person (S) My cousin (M) is 1458 cm's from the unknown person (S). I (A) am described as a Cousin to (S) (M) is ...
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1answer
138 views

How could I be 10% French when there's no French in my mother or father's DNA results?

Ancestry DNA says I'm 10% French. My father never got tested, but my half sister and cousin on my father's side (who were both identified by the site) both tested as 100% European Jewish. My ...
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1answer
104 views

Understanding shared match of 1,177 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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1answer
93 views

Understanding 1,102 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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1answer
130 views

How accurate is Ancestor Timeline of 23andMe?

My Ancestry composition at 23andMe states: "You most likely had a French ancestor, second, third, fourth or fifth great grandparent who was 100% French born between 1760 and 1850." How accurate is ...
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1answer
85 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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21 views

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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