# Understanding second cousin match on AncestryDNA?

Possible relationships:

First cousin Half first cousin (sharing one grandparent)
Great-great-grandparent or great-great-grandchild Second cousin
Great-aunt or -uncle or great-niece or -nephew Great-great grandparent or great-great-grandchild
First cousin once removed Great-great aunt or uncle or great-great-niece or nephew

## What does 2nd cousin mean on ancestry?

“Second cousins” means that the closest common ancestor is a great-grandparent. Third cousins, then, have a great-great-grandparent as their most recent common ancestor.

## How much DNA do we share with 2nd cousins?

We say that two individuals share DNA when both individuals inherited the same DNA from the same ancestor.
Percent DNA Shared by Relationship.

Relationship Average % DNA Shared Range
2nd Cousin 3.13% 2.85% – 5.04%
2nd Cousin once removed 1.5% 0.57% – 2.54%
3rd Cousin 0.78% 0.3% – 2.0%
4th Cousin 0.20% 0.07% – 0.5%

## What is a second cousin match?

Second cousin is the estimated relationship for a DNA match

Your grandparents are separated from you by two degrees, and your first cousins by four degrees, for example.

## What ancestors do 2nd cousins share?

great-grandparent

First cousins share a grandparent, second cousins share a great-grandparent, third cousins share a great-great-grandparent, and so on. The degree of cousinhood (“first,” “second,” etc.) denotes the number of generations between two cousins’ parents and their nearest common ancestor.

## How do you determine a second cousin?

What Is a Second Cousin?

1. First cousins share a grandparent (2generations)
2. Second cousins share a great-grandparent (3 generations)
3. Third cousins share a great-great-grandparent(4 generations)
4. Fourth cousins share a 3rd-great grandparent (5 generations)

## What is difference between 1st and 2nd cousins?

They share a set of grandparents. First cousins are the same generation as each other. They’re both two generations away from the grandparents they share. Second cousins are the children of first cousins.

## How genetically close are second cousins?

First and second cousins share fewer genes. First cousins only share about 12.5% of their genes and second cousins only 3.1%. No matter how related two family members are, they all share some genes in common.

## How do you determine your cousins lineage?

First cousins share grandparents, counting back two generations to their shared ancestors. Second cousins count back three generations to their great-grandparents. Third cousins count back four generations to their great-great-grandparents.

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