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Via 23andme's service I have found and confirmed lots of relatives from my fairly large extended family.
The pattern that I see, and the pattern that anyone would predict, is that the "quantum of relatedness" for (i) my siblings is about 50%, (ii) my aunts and uncles is about 25%, (iii) my first cousins is about 12.5%, (iv) my first cousins once removed is about 6.25% and (v) my second cousins is about 3.125% and so on ad infinitum.
What's unusual to me is that I have one male relative who is expressed by 23andMe as "7.07% shared, 24 segments" and who is the same paternal haplogroup as me. My father's father was an only child. His father had two sisters and no brothers, so there's a nice little Y chromosome bottleneck.
Maybe my great-grandparents put a child up for adoption and this relative is a cousin to my father? Maybe my grandfather had a child out of wedlock and this relative is my half cousin?
I'm not aghast at any of this, I'm just curious if anyone has any ideas that I'm missing.
Via 23andme's service I have found and confirmed lots of relatives from my fairly large extended family.
The pattern that I see, and the pattern that anyone would predict, is that the "quantum of relatedness" for (i) my siblings is about 50%, (ii) my aunts and uncles is about 25%, (iii) my first cousins is about 12.5%, (iv) my first cousins once removed is about 6.25% and (v) my second cousins is about 3.125% and so on ad infinitum.
What's unusual to me is that I have one male relative who is expressed by 23andMe as "7.07% shared, 24 segments" and who is the same paternal haplogroup as me. My father's father was an only child. His father had two sisters and no brothers, so there's a nice little Y chromosome bottleneck.
Maybe my great-grandparents put a child up for adoption and this relative is a cousin to my father? Maybe my grandfather had a child out of wedlock and this relative is my half cousin?
I'm not aghast at any of this, I'm just curious if anyone has any ideas that I'm missing.
Will the relative share information? That's what is frustrating about 23AndMe.
Having the same paternal haplogroup does not necessarily mean you share the full Y chromosome.
Will the relative share information? That's what is frustrating about 23AndMe.
Having the same paternal haplogroup does not necessarily mean you share the full Y chromosome.
Yes, I second this. You can't assume the haplogroup is directly related to the autosomal DNA you share unless you do a proper Y-DNA test, preferably the "big Y" I think. It's entirely possible your haplogroup relation is from several thousands of years ago, while your autosomal relation is from a different, more recent branch. You can be related to the same person in more than one way - especially if one of the ways is from further back than it is possible to trace the paper trail. So this match could still be a relation from any of your grandparents or great grandparents (7.07% is probably most likely to be an estimated 1st-2nd cousin).
Good thoughts... Since I sent the invite on 23andMe, someone unfamiliar to me but with the same surname has viewed my LinkedIn profile...
If you have the same haplogroup, it wouldn't be hugely unusual to have the same surname but again, you can still be related to they in more than one way. The y-DNA and surname link might still pre-date the autosomal relation from a different branch... while the autosomal DNA, or at least some of it, is from more recent. It's also possible the combo of being related on two different branches means your autosomal relation is being predicted as closer than it is. I have one match who was estimated at a 4th-6th cousin but she is actually a 7th-8th cousin three times over (we match on three different colonial branches) so the system thought we were closer related than we are.
If you have the same haplogroup, it wouldn't be hugely unusual to have the same surname but again, you can still be related to they in more than one way. The y-DNA and surname link might still pre-date the autosomal relation from a different branch... while the autosomal DNA, or at least some of it, is from more recent. It's also possible the combo of being related on two different branches means your autosomal relation is being predicted as closer than it is. I have one match who was estimated at a 4th-6th cousin but she is actually a 7th-8th cousin three times over (we match on three different colonial branches) so the system thought we were closer related than we are.
The geography and timing of my families could support the "double-dip" hypothesis.
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