Author Topic: Common Ancestors on Ancestry - an odd thing  (Read 716 times)

Offline LizzieL

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Common Ancestors on Ancestry - an odd thing
« on: Thursday 16 July 20 10:33 BST (UK) »
I have a match at 10 cM with CM (full name given on Ancestry). Ancestry has flagged it up as a Common Ancestor match. CM's surname is the same as one of my direct ancestors which I have researched reasonably well, so it was clear to see where our trees overlapped and confirm that he was my 5th cousin once removed. Our common ancestors were my 4 x great grandparents (and his 5 x great grandparents). CM manages the test for EM. My match with EM is at the same level and the tree attached to EM's results is the identical tree attached to CM's results, same size, same name, same home person. In fact if the tree was just called "M... family tree" instead of "CM's family tree", I wouldn't know which of the two people was the home person.
 
Both EM and CM appear on the tree (obviously as private). EM is CM's son, so he would be my 5th cousin 2 x removed
But I don't have a common ancestor match with EM according to Ancestry. Can anyone suggest why this should be?
Berks / Oxon: Eltham, Annetts, Wiltshire (surname not county), Hawkins, Pembroke, Partridge
Dorset / Hants: Derham, Stride, Purkiss, Scott, Sibley
Yorkshire: Pottage, Carr, Blackburn, Depledge
Sussex: Goodyer, Christopher, Trevatt
Jersey: Fowler, Huelin, Scott
Essex/Herts: Livermore, Holgate, Law, Day, Myson, Boyton
Norfolk/Suffolk: Stone, Alexander, Tipple, Ingate

Offline Flemming

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #1 on: Thursday 16 July 20 10:42 BST (UK) »
Perhaps your shared cMs with EM are less than 6cM * so Ancestry won't show it.

* soon to be less than 8cM.

Offline Gadget

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #2 on: Thursday 16 July 20 12:39 BST (UK) »
Quote
Both EM and CM appear on the tree (obviously as private). EM is CM's son, so he would be my 5th cousin 2 x removed
But I don't have a common ancestor match with EM according to Ancestry. Can anyone suggest why this should be?



If EM is CM's son and you share only 10cMs with CM, it is quite likely that EM and you share less than 6cMs, as Fleming has said.
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Offline LizzieL

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #3 on: Thursday 16 July 20 12:50 BST (UK) »
Perhaps your shared cMs with EM are less than 6cM * so Ancestry won't show it.

* soon to be less than 8cM.

As I said in my post my shared DNA with EM is at the same level as CM - ie 10 cM. I am showing a match with EM but it is not flagging up as a Common Ancestor as it is with CM, despite the identical tree being linked to both people. This made me think at first they were brothers but further research showed they were father and son.
Currently Common Ancestors will work for levels down to 6cM - I have several at that level and 7cM which I have verified.
Berks / Oxon: Eltham, Annetts, Wiltshire (surname not county), Hawkins, Pembroke, Partridge
Dorset / Hants: Derham, Stride, Purkiss, Scott, Sibley
Yorkshire: Pottage, Carr, Blackburn, Depledge
Sussex: Goodyer, Christopher, Trevatt
Jersey: Fowler, Huelin, Scott
Essex/Herts: Livermore, Holgate, Law, Day, Myson, Boyton
Norfolk/Suffolk: Stone, Alexander, Tipple, Ingate

Offline Gadget

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #4 on: Thursday 16 July 20 13:24 BST (UK) »
Do they both appear in ThruLines?
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Offline LizzieL

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #5 on: Thursday 16 July 20 13:36 BST (UK) »
No, only CM. But doesn't that use the same matching process? If I click on common ancestor or on thrulines I get the same suggested relationship pathways and set of Ancestry trees to look at.
Berks / Oxon: Eltham, Annetts, Wiltshire (surname not county), Hawkins, Pembroke, Partridge
Dorset / Hants: Derham, Stride, Purkiss, Scott, Sibley
Yorkshire: Pottage, Carr, Blackburn, Depledge
Sussex: Goodyer, Christopher, Trevatt
Jersey: Fowler, Huelin, Scott
Essex/Herts: Livermore, Holgate, Law, Day, Myson, Boyton
Norfolk/Suffolk: Stone, Alexander, Tipple, Ingate

Offline Gadget

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #6 on: Thursday 16 July 20 13:53 BST (UK) »
It's very odd if they share the same cMs and have the same tree. I wonder if it's because they share the same tree :-\

I think iIve got a few with shared trees but with higher cMs - I'll go and look.
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Offline LizzieL

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #7 on: Thursday 16 July 20 13:58 BST (UK) »
I don't usually look at thrulines, but since I last looked at, I've been given a lot of invented green ancestors. 
Berks / Oxon: Eltham, Annetts, Wiltshire (surname not county), Hawkins, Pembroke, Partridge
Dorset / Hants: Derham, Stride, Purkiss, Scott, Sibley
Yorkshire: Pottage, Carr, Blackburn, Depledge
Sussex: Goodyer, Christopher, Trevatt
Jersey: Fowler, Huelin, Scott
Essex/Herts: Livermore, Holgate, Law, Day, Myson, Boyton
Norfolk/Suffolk: Stone, Alexander, Tipple, Ingate

Offline Gadget

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Re: Common Ancestors on Ancestry - an odd thing
« Reply #8 on: Thursday 16 July 20 14:04 BST (UK) »
Something odd - I think I've discovered something similar.

I've looked at two shared matches. The daughter manages her father's info.  Only she comes up in Common Ancestors and ThruLines although other matches in the same line are there.  Her tree is linked but his, although the same, is an unlinked one  :-\

Add - ThruLines accesed via the Common Ancestors option
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