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(New Scientist)   13 million member family tree shows when the tree started forking because people were no longer farking relatives   ( divider line
    More: Giggity, Family, family tree, 19th century, biggest family tree, Wellcome Trust Sanger, close relatives, giant family tree, early 19th century  
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2498 clicks; posted to Geek » on 02 Mar 2018 at 2:35 PM (45 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»

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2018-03-02 01:49:49 PM  
i.imgur.comView Full Size
2018-03-02 01:52:53 PM  
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2018-03-02 02:45:21 PM  
2018-03-02 03:07:32 PM  
...and NOTHING of value was lost...
/fark them
2018-03-02 03:28:32 PM  
Brava, subby.
2018-03-02 03:29:53 PM  
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2018-03-02 03:30:52 PM  
Did I miss it or did an article starting with "check out this family tree" not link to the family tree ? I'd be happy to participate without getting ancestry dot com involved.
2018-03-02 04:03:25 PM  
Biggest ever family tree shows when cousins stopped having sex*

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2018-03-02 04:35:34 PM  

Invincible: Did I miss it or did an article starting with "check out this family tree" not link to the family tree ? I'd be happy to participate without getting ancestry dot com involved.

You can get the family tree data from though all the people's names are removed.

the data was compiled by the Erlich lab. The head of the lab Yaniv Erlich has taken a leave of absence to become Chief Science Officer at MyHeritage the parent company of where the data came from. You may need paid subscriptions to both sites to do useful things.​m​a​ge
2018-03-02 04:35:43 PM  
Let's just say I had sex relatively early
2018-03-02 04:45:07 PM  
Mean Girls Cousins.wmv
Youtube RW4vOpOEGhg
2018-03-02 04:51:00 PM  
2018-03-02 07:34:58 PM  
the tree started forking because people were no longer farking relatives

So shouldn't the number of Trump supporters be going down?
2018-03-02 09:01:13 PM  
The data that I have on my family tree is probably around 15000 individuals. When I started out I kind of kept a tally in my head of 1st cousin marriages and stopped when it was around 2 dozen. 2nd cousin marriages I would guess to be 1 to 2 hundred. 3rd cousins much higher. I am my own 6th cousin on my fathers side and my own 8th cousin several times in both parents trees. I would assume most people would discover this if they could find the information.
2018-03-02 09:16:47 PM  
The average distance for a marriage in the 19th century America was fourth cousins and six miles (10 kilometers). The average distance since the automobile is 7th cousins and 60 miles (100 kilometers).

I read a much more complete and direct description of this project and its conclusions.

New Scientist is a popularizing magazine which I love--I am a subscriber online but bought it weekly on my weekly media spree for many years until I had to cut costs on my excesive media spending.

It takes eight to nine generations to effect real inbreeding and you really have to go at it. There are pockets of inbred people in modern cities (among the lumperproletariat and the lower non-working classes) and in some few areas in rural places where poverty, low immigration and even forest fires have restricted the population (Lac St-Jean, Quebec is one--only four families survived the forest fire). It is a bit too remote and a probably took a century for the forests and farms to grow back properly.

French Canadian families have many genetic maladies which are popular subjects for medical researchers to study and which give a boost to genealogy, but these are very small populations and the general population is quite well-mixed and diverse enough to be healthy.

I have small family tree on and a much larger one elsewhere. I also have contacts with DNA testing companies and genealogical companies so there is a good chance that my family is in the 13,000,000 person family tree, although this a small select group compared to the total number of family trees and individuals even on That family tree is basically a world family tree with tens of millions of members, but the study narrowed their field by eliminating several categories of family trees and people from the study for scientific and statistical reasons I need not explain.

My own family tree is a good-sized sample, small by the standards of professional genealogists who obsessively do their own family trees using everybody else's trees as fodder, and large by the standards of even good and hard-working genealogists who carefully document everything.

I haven't got the patience but I have some pretty powerful tools and skills to apply the mistake-riddled crap that "real" genealogists of the old school lament.

I am a bit of an outlier in many, many ways. But I do my best to control my impatience and eagerness, while doing a lot of busy work as I go along to repair past mistakes and the inevitable low quality ore that comes from strip-mining mountains, turning them into lakes and pits.
2018-03-02 09:28:15 PM  
The average American marriage in the 19th century lasted 11 years. For a while there, the average marriage when divorce became relatively common, acceptable and easy was down to three. But it is no longer rare to find people celebrating silver, gold, diamond anniversaries because people are not dying as young or as often as they used to. We all die, but it takes some of us two or three lifetimes to get around to it nowadays.

They had no divorce but they had plenty of runaway brides and grooms, plenty of widows and widowers. Eleven years was the average lifespan of people who married after their first, second or third marriages.

They also had enormous numbers of children, usually by several partners. So you didn't have a large selection of virgins, if you catch my drift. Hence the popularity of marrying your 14 year old cousins before some bastid who isn't even a cousin got to them.

First and second cousin marriages are still common in much of the world and in bits of the US and Canada. But fourth cousin is not really close and 7th is quite distant.

Think in terms of powers of two

1 - You
2 - parents (siblings)
4 - grandparents (1st cousins)
8 greats (2nd cousins)
16 2-greats (3rd cousins)
32 3-greats (4th cousins)
64 4-greats (5th cousins)
128 5-greats (6th cousins)
256 6-greats (7th cousins)

By the time you reach 7th cousins you are practically not related at all. You share an eighth of your DNA with each great-grandparent, a 16th with each grand-aunt and grand-uncle, and 1/32nd with each 3rd cousin.

So marrying 4th cousins is not a real problem unless you over-do it for a few centuries.
7th cousins are quite sustainable.

I have tonnes of 8th through 13th cousins born in North America. I am in the famous Generation 13.

I wish I could get my hands on that research stripped of the numbers or code names. My family tree would suddenly be about 65 times bigger, rounding my tree up to the nearest 100 thousand.
2018-03-02 09:38:07 PM  
I have had a number of genetic tests and have paid for my parents and one aunt to be tested. I know that autosomal (regular DNA) testing is often useless beyond six generations unless you have a number of cousin marriages (1st and 2nd) and maybe a few multiple cousin marriages (Seven Brides for Seven Brothers, assuming there was fewer than fourteen families involved).

I have both kinds in the not too far distant past, which is not exactly healthy but not exactly unusual outside of the big urban centers where people are highly mobile.

They act like magnifying glasses that can bring a genetic focus on some ancestors over other ancestors. But this is limited and seldom causes genetic tares (recessive traits of a damaging sort) to emerge.

But by about six or severn generations you hit a paradox:  some of your ancestors have not left you any genes at all. They are your ancestors but you share nothing of any importance. Other ancestors can still be traced genetically as far back as 10 generations because they are in the upper branches of your tree in more than one place. 10 generations is about 1,024 ancestors in the same generation of your tree. 30 generations is over a billion ancestors sitting all in a nice line, despite great differences in ages from 0 to 100, perhaps.

But there were not 1,000,000,000 people in the world earlier than the late 18th century, so a billion people on the top of your family tree is more than the whole population of the earth for years and years and years.

They repeat. Your tree collapses from a fan into a diamond or losenge shape. This is called pedigree collapse.

In small communities this is what real inbreeding in the most general form looks like. What we commonly mean by inbreeding is actually more like incest, and while it is more common than people let on, it is very rare even in primitive peoples. Almost all tribes out-breed by swapping brides or grooms or both at literal or notional CFs.
2018-03-02 09:41:20 PM  

Hand Banana: Biggest ever family tree shows when cousins stopped having sex*

[ image 315x259]

Would you sleep with your Republican cousins? I don't think I would. Nothing good would come of it, that's for sure.
2018-03-02 09:44:12 PM  

croesius: [ image 800x400]

I think they have way too many generations in that family pedigree. 75 years would be three very brief generations. Unless they are wrapping around, that chart looks like maybe 10 generations or more.

Maybe the idiots are Mormons or something? I have a lot of Mormon cousins and things become fraught when you marry 25 or 35 women, which is a lot even when marriages last three years on average.
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