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ιδιοκτήτης
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Registered: 07-2006
Location: Oχάιο
Posts: 69848
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DNA relationship with relatives


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SS eH PF
12/1/2017, 1:46 pm Link to this post Send PM to Susa Blog
 
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ιδιοκτήτης
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Registered: 07-2006
Location: Oχάιο
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SS eH PF
12/5/2017, 3:26 pm Link to this post Send PM to Susa Blog
 
nannypols Profile
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Pauline, geek in training
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Registered: 01-2008
Location: England
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I don`t really understand this Susan, but my dil (mother to gks) has just found a photo of me getting married to my first husband, he being the father of her husband, ie. my eldest son, and therefore biological grandfather to her children.. I can understand her interest.

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12/23/2017, 5:00 am Link to this post Send Email to nannypols   Send PM to nannypols
 
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ιδιοκτήτης
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Registered: 07-2006
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You cannot understand this unless you do a DNA test and compare it to your relatives' DNA. It helps a person figure out their relationship to someone you do not know, but took the test and shares your DNA.

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SS eH PF
12/23/2017, 10:15 am Link to this post Send PM to Susa Blog
 
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ιδιοκτήτης
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Registered: 07-2006
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Here is the chart to use for GEDmatch Generations:

Gen 1
Well, that’s easy – it’s always going to be a parent-child relationship

Gen 1.2
Oddly, this is always a sibling relationship

Gen 1.4
Half-sibling
Uncle ~ niece
Grandparent

Gen 1.5
Uncle ~ niece
This makes sense: the common ancestors for my uncle are his parents, which is 1 generation, but for me, his niece, it is my grandparents, 2 generations. Therefore, the Gedmatch Generation is calculated as being between 1 and 2 = 1.5

Gen 1.6
Uncle/aunt ~ niece/nephew
Grandparent

Gen 1.9
1C (first cousins), whose common ancestors are their grandparents, which is 2 generations

Gen 2.2
1C (first cousins)
1C1R (first cousins once removed)

Gen 2.3
1C1R (first cousins once removed)

Gen 2.5
1C1R (first cousins once removed)
Again, this makes sense: my cousin is a generation older than me, his grandparents, which is 2 generations, are my great-grandparents, which is 3 generations. Therefore, the Gedmatch Generation is calculated as being between 2 and 3 = 2.5

Gen 2.6
1C1R (first cousins once removed)
2C (second cousins)

Gen 2.9
2C (second cousins)

Gen 3.0
2C (second cousins)
This is the ideal scenario, with the common shared ancestors for me and my match both being 3 generations back.

Gen 3.3
2C1R (second cousins once removed)

Gen 3.5
2C1R (second cousins once removed)
Again, this makes sense: my second cousin is a generation older than me, her G-grandparents, which is 3 generations, are my GG-grandparents, which is 4 [sign in to see URL], the Gedmatch Generation is calculated as being between 3 and 4 = 3.5
3C (third cousins)
2C2R (second cousins twice removed)
Here we have a case of our common ancestors being my G-grandparents, 3 generations, but these ancestors are my matches GGG-grandparents, 5 generations: a difference of two generations between me and my match

Gen 3.6
2C1R (second cousins once removed)
3C (third cousins)

Gen 3.7
2C1R (second cousins once removed)
3C (third cousins)
3C1R (third cousins once removed)

Gen 3.8
2C2R (second cousins twice removed)
3C (third cousins)

Gen 3.9
3C1R (third cousins once removed)

Gen 4.0
3C (third cousins)
This is the ideal scenario, with the common shared ancestors for me and my match both being 4 generations back.

Gen 4.1
2C1R (second cousins once removed)
2C2R (second cousins twice removed)
2C3R (second cousins three times removed)
This is quite an unusual because our shared common ancestors are my GGGG-grandparents, 6 generations back, but my match’s shared common ancestors are only his G-grandparents. That’s a difference of three generations, even though my match is just 10 years older than me! This is because I am descended from the eldest child of our common ancestor, but my match is descended from the youngest child, who was 25 years younger; and likewise my ancestors were the eldest of young parents, but my cousin’s parents and grandparents had children late in life, which resulted in this apparent shift of three generations even though me and my match are in the same present-day generation! Yes, just think about it for a moment 😀
3C1R (third cousins once removed)

Gen 4.2
2C1R (second cousins once removed)

Gen 4.3
3C (third cousins)

Gen 4.4
2C2R (second cousins twice removed)
3C (third cousins)
3C1R (third cousins once removed)
3C2R (third cousins twice removed)
4C (fourth cousins)
4C1R (fourth cousins once removed)

]Article HERE

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SS eH PF
1/6/2018, 5:02 pm Link to this post Send PM to Susa Blog
 


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