Understanding shared DNA of 1,576 cM with great nephew

How many cM is a nephew?

The range for niece/nephew (121-2227 cM) translates to 1.7-31.8%. That is an amazingly wide range, and 16% definitely falls within it! Still, you might worry that the lower number is a fluke and that the person who reported it was wrong about the relationship.

What does cM mean on ancestry?

centimorgans

We show the shared amount using centimorgans (cM), a unit used to measure the length of DNA. The higher the number, the higher the confidence, and in general, the closer the relationship. Since you can share DNA with your match on one or more segments in different locations in the genome, we show you how many.

How much DNA do you share with relatives?

Average Percent DNA Shared Between Relatives

Relationship Average % DNA Shared
Parent / Child 50% (but 47.5% for father-son relationships)
Full Sibling 50%
Grandparent / Grandchild Aunt / Uncle Niece / Nephew Half Sibling 25%
1st Cousin Great-grandparent Great-grandchild Great-Uncle / Aunt Great Nephew / Niece 12.5%

What does shared DNA mean?

Shared DNA segments, also referred to as ‘matching segments’, are the sections of DNA that are identical between two individuals. These segments were most likely inherited from a common ancestor.

How many cM is a good DNA match?

A strong match will have around 200 cM or more.

How many centimorgans do aunt and niece share?

23andMe

Relationship Range in percentages Range in centiMorgans
Parent / child 50% ~3719 CM
Father / son (no X sharing) 47.54% ~3536 cM
Full sibling 38% – 61% 2826 – 4537 cM
Grandparent / grandchild; Aunt / uncle; Niece / nephew; Half siblings 17% – 34% 1264 – 2529 cM

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