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Old 6th April 2018, 02:06 PM
Cats Cats is offline
FTDNA Customer
Join Date: Oct 2006
Posts: 237
siblings, matches in common

How many in-common matches do you have with a tested sibling?

I have 1516 matches, my brother has 1620 matches.

We share 846 matches which is about half. Isn't that a bit low?
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Old 6th April 2018, 07:54 PM
dna dna is offline
FTDNA Customer
Join Date: Aug 2014
Posts: 2,982
I do not know whether it is low, but it is noticeably higher than my family average.

In your case, if we convert to percentages, it is 52.2% / 55.8%.

Here are four pairs of siblings from my extended family listed from the lowest to the highest:
  • 17.9% / 20.4%
  • 26.3% / 32.9%
  • 29.7% / 41.2%
  • 45.1% / 48.6%
All are Family Finder tests and not transfers.

Mr. W.
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Old 6th April 2018, 08:02 PM
Bob Hesse Bob Hesse is offline
FTDNA Customer
Join Date: Nov 2016
Posts: 14
I manage my account and those of my four full siblings.

We individually have 2921 to 3403 matches. The sibling-to-sibling match rates using In Common With range from 32.0% to 58.5%

A few months ago I pulled all of our matches together into one file. At that time we had 2575 to 3004 matches, and we matched a total of 6121 unique individuals.
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Old 7th April 2018, 01:38 AM
Epiphyte Epiphyte is offline
FTDNA Customer
Join Date: Apr 2018
Posts: 25
more examples

Of my 2300 matches:
286 (12%) in common with paternal half-sibling
1162 (50%) in common with mother

Phasing of 2300 matches using mother and paternal half-sib:
819 (36%) Maternal
189 (8%) Paternal
2 (0.5%) Both!

Mother and her brother (full sibling) had interesting difference in number of 4th and closer cousins on Ancestry:
Mother: 341
Mother's brother, full sibling: 494
Matches in common (Ancestry, 4th and closer): 50 (15%/10%)
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Old 16th April 2018, 11:04 AM
keigh keigh is offline
FTDNA Customer
Join Date: Sep 2013
Posts: 477
My brother and I have tested and the results are that he has a total match number of 5,058 of which 2,841 don't match with me. My total match number is 4,607 of which 2,391 don't match my brother. So 56.17% of his matches aren't mine and 51.9% of my matches aren't his. So in general we match about 1/2 of each other's matches.

That is if I've done the math right.
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Old 19th April 2018, 10:56 AM
MoberlyDrake MoberlyDrake is offline
mtDNA: T2b5 | Y-DNA: J-M172
Join Date: May 2010
Posts: 1,546
My cousin has 721 matches. His sister has 813. They only share 192 matches.
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