This video immediately called my attention. My father has double first cousins (grampa's brother married gramma's sister). But recently I found out that my grampa had double cousins too.
How would this work with 2C1R? I have a 2C1R I share 567 with. Her first cousin and I share 327. We share a set of GG grandparents for me, G grandparents for them. They're grandparents are the siblings to my G grandparents. I have another 2C1R who also is a G granddaughter to my GG grandparent couple, who I share 406 with. I'm not sure which of the children of the GG grandparents couple she descends from as her dad was adopted. Could be the same as the others. So how would this play out? Thanks in advance 😊
It would be interesting to see a video on what my family sees as a double first cousin (perhaps we are mistaken). This is when a brother and a sister from family "A" get married to a sister and a brother from family "B". Both weddings are between unrelated people, just that the two weddings happen to have two pairs of siblings. The children produced from these two weddings are what we think of as double cousins as all of the cousins only have two pairs of grandparents that are common ancestors to all of the double cousins. Normally, cousins would have one pair of grandparents that are common ancestors. In your video, the first cousins get married to each other and have offspring. So, I get confused by the title of the video "Do Double First Cousins Have the Same DNA as First Cousins?" as the title seems to be a bit different to the video that I just watched about 2x1st cousin once removed, rather than double first cousins. Perhaps there are a couple of words missing from the title?
Double first cousins are the children of siblings who married other (unrelated) siblings, such as 2 sisters with 2 brothers, sister and brother pairings: Mary and Jane Doe married Mike and Steve Smith; Ann Jones married Dave Green; Bob Jones married Jill Green; or any other brother/sister combo. Their kids would be double first cousins to each other. Yes, the video is misnamed. In DNA these cousins would appear as possible half-siblings, aunts/uncles, or grandparents, because they'd should that amount of DNA (about 25%).
I'll blame the naming on Devon (partly), she may not have understood the video. However, the confusing part comes in that double relationships can happen in multiple ways. The more distantly related the double relationship, the increased number of ways it could happen. However, there isn't a naming convention that distinguishes between these.
I have double cousins (2 brothers married 2 sisters) as well as cousins that I have multiple relationships with. I only use double cousins to refer to the first scenario. There are some cousins that I am related to through 4 separate shared ancestor couples. The wagon trains of pioneers have interesting ramifications. I definitely do not call them quadruple cousins. This video was disappointing because of the misleading title.
@@FamilyHistoryFanatics Uh, oh. I hope she doesn't read this or there could be trouble!!! I think it should really be the amount of DNA as it would be unlikely, almost impossible to have identical first cousins from one branch of your tree with a double first cousin who would come from another branch, don't you think (hope that made sense)?
how did you work out that the double 1st cousin once removed would have about the same amount of DNA as a 1st cousin? I watched again to see if I missed that jump. I have numbers of relatives that are both 2nd cousins and 3rd cousins.
1c1r share half as much DNA on average as 1C. Therefore double 1C1R would have twice as much DNA as 1C1R or roughly the same amount as 1C. However, I would expect it to be spread out in more smaller segments.
I've been waiting for this video explanation. After viewing several times and you drawing it out was very helpful, I think I understand. However; reading the comments and others explanation, and of course your definition of double cousins, I got it. I have several "traditional" double cousins and an interesting one I don't know what to call. My maternal paternal great grandfather married my maternal maternal great aunt and they had a child. This child is double related to whom (both my grandparents)? How would this child's children and grandchildren be related to me? Does the DNA percentages work the same way as in the video? Think I'm confused a bit. Can anyone help me understand?
My Mother brother married my Dads sister, my Mother’s sister married my Dads brother, and obviously my parents were married. My sister and brothers biological mother died when my brother mother died. My Dads sister had a child with her first husband who died in WWII. However 9 of my first cousins and I share the same grandparents.
My 3rd great grandparents were double first cousins, what does this mean for me? I am still really confused. So, my 2nd GGF only had 4 great grandparents :/
I’ve been trying to do the Leeds method, (separating 4 lines) but it appears that the colors are intermixing with other colors.. (like my mother’s maternal and paternal lines are showing upon the same list..) idk if I’m doing it wrong. I filtered from 90-400 but I think I have more close matches on mom’s Paternal side(which I’m still trying to figure out who my biological grandpa was) it seems mom has closer matches on the unknown side, as opposed to the known side. What do I do??? I’m thinking about starting color coding over because at this point I’m sooo confused! The highest match is on my mom’s paternal line (943cms) we don’t know him and haven’t gotten a response from ancestry. What I do know is that his mom is a sister to mom’s unknown father.
Growing up, my brother and I did not get along with our double first cousins. My mother's brother was married to my father's sister. I think that we were all formed in our characters and personalities by how different our mother's were. It was confusing, when I was little, that the cousins that we least cared for knew all of our grandparents, aunts, uncles and cousins and the others did not. Our favorite aunt and our favorite uncle were the ones with whom we shared no common ancestors. People are weird and of all the cousins my brother and I were undeniably the weirdest.
I have one for you.. My mom and two of her cousins married brothers, were all doubled related there, the first time, were related 3 times no blood relationships married if this helps in marking a tree. Our mom's and her two cousins side of the tree: And our mom's, moms (our grandmothers, are sister's too) they are our great aunts.. And our mom's, dad's. (our grandfather's,) they're first cousin's, they married our great aunt making them Our great uncle.
I have 4 cousins who are double cousins ( in the sense that their fathers are brothers ( and my mother's brothers) they had married 2 sisters from another family).
My great grandfather and great grandmother each had a sibling who married each other (a brother and sister married another brother and sister) and they were all very prolific families. Although the connection isn't as close as the one talked about here it means that I have hundreds of double cousins and even though it doesn't affect the DNA matches to any significant degree it makes genealogy rather interesting to say the least. Add to that that there were further marriages across generations between these two families (seven marriages in all) it gets even more interesting.
Add to that that one of my great uncles married his first cousin I have one relation who is both my first cousin once removed and my second cousin once removed.
Double cousins for e: On my maternal side my great great grandfather divorced and re-married a woman whose sister was (later on) related on the other side. In other words, my great great grandfather (my grandmothers PATERNAL grandfather) married my great aunt on my grandmothers MATERNAL side. It's nothing weird, just complicated.
My Dad has Double Cousins, his Mother's younger brother married his Father's younger sister, he always said that they were like half siblings (DNA wise he meant). This is my 1st cousin 1x removed (son of a double cousin);" 1st cousin 1x removed, 849 cM | 12% shared DNA". This is my 1st Cousins child: "1st cousin 1x removed, 537 cM | 8% shared DNA" so I'm closer in DNA to the Double cousins child vs. my own 1st cousins child! Very interesting!
Yep. Double Cousins, in terms of total shared cMS can look more closely related than you would expect. HOWEVER, I have a video about how you can tell the difference between a close relative and a double cousin. Stay tuned.
Question? My husband is double first cousins. Siblings married siblings. He also has half siblings. Am I right in thinking he shares about the same DNA with his double first cousins as he does with his half siblings?
I have learnt that what you have written is correct. I think that this is true. Descendants of the first cousins also share more DNA. It's like one generation has been skipped and replaced by the "half" term if you compare the shared DNA with non-double cousins. So, double second cousins share the same DNA as half first cousins, double third cousins are similar to half second cousins etc...
The double 1st cousin once removed who asked the question will, however, more likely be reported on the lower end of the 1st cousin range, not because their amount of shared DNA shouldn't be doubled, but because the cousin who is the child of 1st cousins will undoubtedly have areas in their own DNA that are full identical regions, and most testing companies will only report FIRs as HIRs in their calculation of shared DNA. So if the child of the 1st cousins has say 216cM worth of FIR in their own DNA, the cousin who asked the question would see an amount of shared DNA 216cM lower than the actual amount of shared DNA because of the full identical regions in the cousin being counted only once.
You are on to something to be sure. I have a follow-up video that talks about full-match and half-matched regions to tell the difference between double-first cousins and half-siblings. But yes, you're on the right path.
Whats a double first cousin? My Grandmothers DNA and mine is only 1 percent lower than her and her first cousin which I thought was strange! Shared DNA between me and my Grandmother was 19% and her and her cousin 18%
A double first cousin is explained in this video, but since you asked early... they are people who share grandparents in more than one way. Think of it as siblings from one family who married siblings from another family.
Don't have any double 1st cousins. Now my dad uncle did marry my mom aunt and they did have kids so my mom and dad share the same 1st cousins. So I guess they would be my double 1st cousin once removed. Sometimes I forget my mom cousin also my dad cousin and wonder why my mom cousin has my last name then I remember and go oh right also my dad cousin.
