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Cousin Chart

This page is a "cousin chart" to help in interpreting Autosomal DNA matches, which are often presented in terms of 1st, 2nd, 3rd, etc. cousins.

Charts

Basic Chart

Cousin
°
Meaning Ancestors Gene-rations
Sep-
arated
Shared
DNA
Shared Total
Parent Father or mother  Parent 2 1 50.0%
Sibling  Sibling, brother or sister  Both parents 2 1 50.0%
Half-
sibling
 Half-brother or half-sister  One parent 2 1 25.0%
1st  Parent's sibling's child  Grandparent 4 2 12.5%
2nd  Grandparent's sibling's child  Great-grandparent 8 3 ~6.2%
3rd  Great-grandparent's sibling's child  2nd-great-grandparent 16 4 ~3.1%
4th  2nd-great-grandparent's sibling's child  3rd-great-grandparent 32 5 ~1.6%
5th  3rd-great-grandparent's sibling's child  4th-great-grandparent 64 6 ~0.8%
6th  4th-great-grandparent's sibling's child  5th-great-grandparent 128 7 ~0.4%
7th  5th-great-grandparent's sibling's child  6th-great-grandparent 256 8 ~0.2%

Removed Chart

"Removed" means that the cousins are in different generations, i.e., add a generation of separation for each degree of removal.

Removal
°
Meaning Shared
DNA
Once Child of _ cousin 1/2 of above
Twice Grandchild  of _ cousin 1/4 of above

See also http://www.isogg.org/wiki/Autosomal_DNA_statistics.