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DNA Shared Between Two People Checklist

DNA Shared Between Two People Checklist

Whether you are looking up the percentage you share between a known relationship or have just got back your DNA results and want to know what the possible relationships are between you and your matches the checklist below will help you figure out the possibilities.

Identical Twins

100% DNA Shared

Parent/Child

50% DNA Shared

Full Siblings

50% DNA Shared (Approx)

Half Siblings

25% DNA Shared (Approx)

Grandparent/Grandchild

25% DNA Shared (Approx)

Aunt-Uncle/Nephew-Niece

25% DNA Shared (Approx)

Double First Cousins

25% DNA Shared (Approx)



Great Grandparent/Great Grandchild

12.5% DNA Shared (Approx)

First Cousins

12.5% DNA Shared (Approx)

Great Aunt-Uncle/Great Nephew-Niece

12.5% DNA Shared (Approx)

Half Uncle-Aunt/Half Nephew-Niece

12.5% DNA Shared (Approx)

First Cousins Once Removed

6.25% DNA Shared (Approx)

Half First Cousins

6.25% DNA Shared (Approx)

Great Great Aunt-Uncle/Great Great Nephew-Niece

6.25% DNA Shared (Approx)

Half Great Aunt-Uncle/Half Great Nephew-Niece

6.25% DNA Shared (Approx)

Double Second Cousins

6.25% DNA Shared (Approx)

Second Cousins

3.125% DNA Shared (Approx)

First Second Twice Removed

3.125% DNA Shared (Approx)

Half First Cousin Once Removed

3.125% DNA Shared (Approx)

Half Great Great Aunt-Uncle/Half Great Great Nephew-Niece

3.125% DNA Shared (Approx)



Second Cousins Once Removed

1.563% DNA Shared (Approx)

Half Second Cousins

1.563% DNA Shared (Approx)

First Cousins Three Times Removed

1.563% DNA Shared (Approx)

Half First Cousins Twice Removed

1.563% DNA Shared (Approx)

Third Cousins

0.781% DNA Shared (Approx)

Second Cousins Twice Removed

0.781% DNA Shared (Approx)

Third Cousins Once Removed

0.391% DNA Shared (Approx)

Fourth Cousins

0.195% DNA Shared (Approx)

Third Cousins Twice Removed

0.195% DNA Shared (Approx)

Fourth Cousins Once Removed

0.0977% DNA Shared (Approx)

Third Cousins Three Times Removed

0.0977% DNA Shared (Approx)

Fifth Cousins

0.0488% DNA Shared (Approx)

Fifth Cousins Once Removed

0.0244% DNA Shared (Approx)

Sixth Cousins

0.0244% DNA Shared (Approx)

Sixth Cousins Once Removed

0.0061% DNA Shared (Approx)

Seventh Cousins

0.00305% DNA Shared (Approx)

Seventh Cousins Once Removed

0.001525% DNA Shared (Approx)

Eighth Cousins

0.000763% DNA Shared (Approx)



Understanding What Is Meant By “Second Cousin Once Removed” And Similar Relationships.

Understanding What Is Meant By “Second Cousin Once Removed” And Similar Relationships.


A lot of people and myself included when they start researching don’t know the actual meaning of relationships like “Second Cousin Once Removed” or “Third Cousin Twice Removed” and only know the simple stuff like great grandfather, great great grandmother etc.

A few things first, in genealogy and on most genealogy related websites the “Great Great Great Grandmother” relationship type is often abbreviated to things like “3xGGM” and “5xGGF” Meaning “Great Great Great Great Great Grandfather”. You get the point, good to know as it saves a lot of time and makes it a lot easier to understand.

With regards to Cousins, it’s actually a really easy concept to learn and one that will allow you to read tree’s and work out relationships with ease. The way it works is in “Generations”. So a “First Cousin” is what most people would just call their cousin, they are the children of your aunts and uncles, simple enough. A “Second Cousin” is where it starts to get a bit more complicated (But stick with it). These to you would be the children in the same “Generation” as you but children of your grandparents children.

Relationship Generations

So say a couple (The Grandparents) have two children , Bob and Tom and Bob and Tom both have two children each and each of those children have a child (See chart above). In the chart Max and Jill are First Cousins. Max and Ben are First cousins once removed. The removed part is where the different generations come in, they are one generation removed from eachother. Ben and Harry are Second Cousins, this is because they are the same generation (So no removal), but have two ancestors between them and their shared ancestors (The grandparents). If Ben were to have a child it would be Harry’s Second Cousin Once Removed and Max’s First Cousin twice removed.

Cousin Chart

The chart above is really helpful for all of the other relationships too. Just replace the “Self” with the person you want to start with, it could be you or could be anyone else then work your way to the person you want to find a relationship with.