How to Triangulate DNA Matches | GEDmatch TUTORIAL Genetic Genealogy

Hi Andy - can we please have a follow up to this? What to do now with these triangulation groups.

Also, when I ran this, I noted my maternal sister in with paternal cousins in the same segment. So we can't take for granted that all people in the same coloured crossmatch group triangulate? If we view it by kit number and check the names in the triangulation, I think we can tease it out this way. Is this correct? Thank you.

This might be a dumb question, but does Gedmatch only use the kit # matches from people that have downloaded their dna to Gedmatch? I have a cousin that I would like to figure out, but he has only done Ancestry, whereas I have done Ancestry, 23andme and Gedmatch.

How do you find Mayflower Ancestors that may be linked to you?

Other question. Is there any way to find out <7cM? I have 9th cousins on papers and we have DNA tests. But we have only small segments <7cM. What can I do to check on triangulation in my case?

Hello.
You have some bug on Triangulated page in GEDmatch.
You write on page:
"All kits shown in columns Kit1 and Kit2 are taken from the selected kit matches to XXXXXXXX
3-Way (Triangulated) segment matches are shown in green."
But some matches are red, not green. First time I think it bad triangulation because of red :-) So rewrite your info about GREEN because it's ambiguous.

would buying the GED match full version provide more matches based on higher cM

The information on the triangulation page states that our common ancestor lines are shown in "green". Are the same colors in many DNA kits common relationships, such as the red matches shown in the video?

Why am I getting red for snip overlaps when I have high total cM shared (ie 2000) for some of my matches?

Any more in depth explanation regarding the difference between a triangulated group and a cross matched group?

I have three people that share a segment on My Heritage,but they only consider some of these triangulation.. Why is this?

I'm a newbie with gedmatch and I'm triangulating for a match that I know matches me on a certain chromasome segment. Several of the resulting matches show up in the same segment with her, but not me. How can that be?

Will this tool help if I don't know who the MRCA is through a match? For example, I don't know who my mother's paternal grandfather is and I'm hoping some of these Tier 1 tools will help me get closer to figuring that out.

Ok I can do this but I can't sort them out afterwards. I need more help. I have a dna match of 105cm. He matches my mom at 155cm.

As a tier one member why do I NOT have the display options?

why is this so difficult to figure out. WHy is it not laid out for simple understanding.

If I were to share info on a one to one with you, could you confirm a full sibling or half sibling match?

Finally understand this a bit better. As always, much more to learn ! Good job.

Great informative video. I am enjoying watching all your video lessons and have learned alot. While watching your posts I recognized your Ancestry photo and have found that we are related and are matches with the Greene Line.

How do i find my matches

Very nice video, Andy! I would like to know what the relationship is between the "cM" entry and the start & end numbers in each row of the triangulation result. Thanks!

I’m so confused. Triangulation is amazing. But currently I’m struggling with figuring out what my dads match is to another family member. Did the autosomal match and I can’t figure out if I’m looking at half sibling or an aunt/nephew relationship. Can you help or steer me in the correct direction?

Thank you for the explanation. It helped me figure out the family of my grandfathers, who was born in 1888, unknown father. Now all I have to do is figure out which one of the 3 males in the family was the father.

Cross Match Highlighted color, does not have to be a highlighted green?

Must matches A, B, and C all have the same starting and ending positions? If all three simply share part of the same segment adequate? If A and B are identical, but C only shares part of their segment, is that triangulation?

One segment I share with Ashkenazi Mexicans Spanish and North African Jews over 70 people all match up the common ancestor would have been Sephardic Jewish I use Tier one. I ran your kit against me no match LOL. Great video.

I’m of Ashkenazi and Sephardic Jewish with a tiny bit of English and Irish ancestry Gedmatch is fun lol.

How can I use Trianglation to find a missing great grand mother identity?

Please!! Having trouble finding your video on how to Paint Chromosomes in DNA Painter. My memory slipping....painted last week and now forgot what tool I used in GedMatch to find data. I am having trouble finding way to communicate with you....

I noticed I have several people who are in the same segment group but one group of them is orange and they are repeated in green. I also noticed a column for TG. The Orange group said TG9_1 and in the green group that column was blank. It looks like not all of the people are in both groups. What is the difference?

What if you don’t remember your ged kit number? Can it be found out?

Don't we share ancestry will all our matches above 10 to 20?

Hi, I am confused about something. When I do a triangulation search on a specific person, Miriam, it shows her matching with Barbara and others on 5 different chromosomes for a total of about 40 cM. However, when I do a one-to-one between Barbara and Miriam, it only shows them matching on one chromosome for a total of 8 cM. Can someone please explain what is going on with that? Thank you.

If I am trying to find a common ancestor between 3 people that is probably found below 3cM, how can I run this report?

Thanks a lot for this! it's time for me to try Tier1 tools.
Would be great if you make a separate video explaining a cross-match concept

i tried a multi kit traingulation on GedMatch I was wondering how to open it in Google sheets spread sheet instead of microsoft spreadsheet?

What does it mean if I compare the dna and it only shows one chromosome match?

I'm adopted and I'm trying to find my father and I want to know how I know if I am looking at my father mom or cousins dna how do I tell them apart

Andy, thank you for all that you and Devon do. It’s watching your videos that encouraged me to upload my Ancestry DNA to Gedmatch. I’m now starting to try and understand what I can learn about my family and I have a question about triangulation. I do not have Tier 1 access, but have been attempting some triangulation and I have a question .
JR is my half 1C 1x removed. We established that thru documentation before either of us took DNA tests so I know which branch of the family she is on. We both match on Chromosome 2 start 13,120,212 End 33,668,178. Another person ( LQ) has contacted me and they match me on Chromosome 2 start 20,878,406 end 33,369,582 , and JR start 20,878,406 end 33,413,640.
Is that a true triangulation of the three of us ? Also, does that confirm LQ is definitely related on the same branch as JR ?
I ask the question for two reasons. Firstly to make sure I understand what constitutes a triangulation. Secondly, LQ contacted me feeling sure our link was on my fathers side, but JR is definitely on my mother side, so this would confirm LQ was also on my mother side ? If so, it eliminates one side of my tree. Sorry if this is a dumb question 
Sorry for the long post.

Andrew

When I tried to triangulate my half brother's kit, it did not show up on a page like you displayed in the video. It gave me a list of kits that matched each chromosome. There was no spreadsheet. I am trying to determine who my brother's father was. Can you give me any advice?

I tried the Tier 1 and mine did not come up with the color code, which I really need. What now

What colours are given for: Paternal on paternal side, maternal on paternal side and Maternal on maternal side and paternal on maternal side.

I love the presentation and it could not be clearer. However, if those matches do not have a tree (and they don't) or you can't tell who the matches are because they use a username, what conclusion can you reach just knowing a few matches share a common ancestor.

My confusion arises when more than 2 triangulated groups form on the same segment and it increases when some members are in multiple groups. An actual although abbreviated example follows. After running the GEDMATCH Tier one Segment Search on one chromosone (in this example X, but I've had the same type of results on other chromosomes also) with minimum of 10 cMs, I used the Triangulation Tool with cross checking. The output indicated 14 triangulated groups in the 145M to 151M range on X - there were other groups in other locations also. There were 47 individual kits across the groups. Each group had between 5 and 18 people. 17 kits were in only 1 group each, 12 kits were each in two groups, 7 kits in three, 7 were in 4 groups and one kit was in 6.

What does this mean? It's not triangulation unless each member of the group matches the all the others, but putting a person in multiple groups for the same segment doesn't make sense to me. Logically it seems that each person would be limited to two As I am not part of an endogamous group what are the odds that I would match so many people on the same segment on both copies of each of our chromosomes and as far as I know I have only two copies - not 14. Obviously I am missing something.

Sorry for the long message. I hope it is clear.

TG23_0 Chr: 23 Triangulated Group: segments range: 145189694-149648283
........Triangulated Group Names:
.............. kit: XXXX Name: Person 1
.............. kit: XXXX Name: Person 2
.............. kit: XXXX Name: Person 3
.............. kit: XXXX Name: Person 4
.............. kit: XXXX Name: Person 5
.............. kit: XXXX Name: Person 6
.............. kit: XXXX Name: Person 7

TG23_1 Chr: 23 Triangulated Group: segments range: 145245430-150354165
........Triangulated Group Names:
.............. kit: XXXX Name: Person 3
.............. kit: XXXX Name: Person 8
.............. kit: XXXX Name: Person 9
.............. kit: XXXX Name: Person 10


TG23_2 Chr: 23 Triangulated Group: segments range: 145420425-149537834
........Triangulated Group Names:
.............. kit: XXXX Name: Person 4
.............. kit: XXXX Name: Person 10
.............. kit: XXXX Name: Person 11

TG23_3 Chr: 23 Triangulated Group: segments range: 145544411-150507512
........Triangulated Group Names:
.............. kit: XXXX Name: Person 3
.............. kit: XXXX Name: Person 8
.............. kit: XXXX Name: Person 9
.............. kit: XXXX Name: Person 14
.............. kit: XXXX Name: Person 15
.............. kit: XXXX Name: Person 16
.............. kit: XXXX Name: Person 17
.............. kit: XXXX Name: Person 18

Hi, just watched some of the videos, is triangulation the place to try and start to find an unknown maternal great-grandfather? What is the difference between this and clustering DNA matches? Unfortunately on Ancestry and on Gedmatch I don't have large numbers of matching cms - the highest on Gedmatch is 42. Many thanks,

Great video! It really helped clear up the "mud" for me! However, the closed captioning needs some work!

Your explanation of "Cross-match" is the best I have seen to date. Great video.

I am trying to build a Lazarus file for my father. I am using my brother's kit and producing a triangulation file cross matched for each individual chromosome. When I find matches of Known paternal cousins, can I add those kit numbers to my dad's lazarus file? If I don't have more matches, I can't get his file to reach 1500. Both of my parents are deceased, and I have kits for my brother & sister. Should I do the same thing for my kit and for my sister's kit in order to obtain some matches? The known cousins would be my dads cousin's children and grandchild.

I have a dna match who could be my first cousin once removed or twice removed
my great grandad married her relative
how come we share dna?

Hi, I have a bunch of triangulations that go back to various children of the same ancestral couple. How do I know which child is my direct ancestor? All my DNA triangles go back to this same family but they match through different kids so I'm not sure of the next step.