# Perplexing Shared DNA Data – First Cousin Once Removed or Half Niece?

## How many centiMorgans would you share with a half niece?

Show activity on this post. Your half niece and you would share between 500-1446 cM, according to the Shared cM Project.

## How does a half aunt show up on ancestry DNA?

Half-siblings, generally speaking, will show up in the “Close Family” category on Ancestry DNA. It is also possible for half-siblings to be placed in the “first cousin” category, since the categorization of our matches is based on the amount of shared DNA.

## How much DNA do half first cousins share?

6.25%

Half 1st cousins share 6.25% of DNA, while full 1st cousins share 12.5% of DNA. In a perfect world where averages were the rule, these relationships would be easy to distinguish by DNA. But DNA doesn’t follow the average, so a Half 1st cousin could share as much or, in some cases, more DNA than a full 1st cousin.

## Can a 1st cousin be a half sibling?

It’s common for people to have half-siblings since not all children share the same two parents. When you take the Ancestry DNA test, since half-siblings only share 25% of their DNA, they may be categorized as your first cousin.

## What percentage of DNA do I share with my niece?

Aunts, uncles, nieces, and nephews

You share about 25 percent of your DNA with a biological aunt, uncle, niece, or nephew. Your aunt or uncle shares 50 percent of their DNA with your parent (their sibling), who shares 50 percent of their DNA with you.

## How many shared Centimorgans is significant?

For example, you’ll usually share about 120 centimorgans with a 3rd cousin, but it’s possible to share as few as 90 or as many as 200.
What does the match confidence score mean?

Approximate amount of shared DNA (in centimorgans) Possible relationship
200—620 2nd cousin
90—180 3rd cousin
20—85 4th cousin
6—20 Distant cousin: 5th cousin — 8th cousins

## What does close family 1st cousin mean on ancestry?

Close Family – First Cousin

Shared centimorgan range: 1,300–2,200 centimorgans. Degrees of separation: 2–4. Possible relationships: Aunt or uncle. Great-grandparent or great-grandchild.

## Can AncestryDNA results be wrong?

Though it’s possible that it’s a mistake, it’s extremely unlikely. Relationship predictions are almost always accurate for people who are second cousins or closer.

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