# Interpreting 23andMe results for half siblings that share 45.5% of their DNA?

From the The Shared cM Project 3.0 tool v4 it appears that 45.5% equates to 3,394 cM. On the same page this suggests that you and your “half sibling” are: quite low within the range (3,330 – 3,720) for a parent-child relationship; fractionally higher than the range (2,209 – 3,384) for full siblings; and.

## Can half siblings share 19% DNA?

It turns out that half-siblings share 25% of their DNA on average. But this is only an average. Because of how DNA is passed down from parents to children, some half-siblings will share more than 25% of their DNA and some will share less.

## What is the range of DNA shared by half siblings?

approximately 25%

The DNA Relatives feature uses the length and number of identical segments to predict the relationship between people. Full siblings share approximately 50% of their DNA, while half-siblings share approximately 25% of their DNA.

## How would a half sibling show up on 23andMe?

(Or grandfather/grandchild or…) But even with this limitation, a 23andMe test will still always call a sibling a sibling. So if the 23andMe test says brother, he is your brother. If it says, nephew, uncle, grandfather, grandson, or half-brother, then he may be your half-brother.

## What does it mean when you share 50% DNA with someone?

While we do get 50% of our DNA from each parent, we don’t get the same 50% as our siblings. In general, there is about a 50% overlap between the DNA you got from your mom and the DNA your brother or sister got from that same mom. So you and your sibling share 50% of 50% of mom’s DNA or 25%.

## How do you read a half sibling DNA test?

In general, a larger sibship index (>1.0) corresponds to a higher likelihood of relationship. The higher that the sibship index is above 1.0, the higher the likelihood that the two individuals are related as siblings. Likewise, a smaller sibship index (<1.0) corresponds to a lower likelihood of relationship.

## How accurate is DNA testing for half siblings?

A “sibling test” might look at less than 100. By looking at so many different parts of the DNA, the more powerful tests can actually say whether or not two people share enough DNA to be half siblings. The other tests can almost never do this. The reason for this isn’t as obvious as you think.

## Can you share DNA and not be related?

Yes, it is possible to share a small amount of DNA with someone and not be related. In other words, it’s possible to share genetic material and not share a common ancestor or any identifiable genealogical connection.

## Can siblings share more than 50% DNA?

Can siblings share more than 50% of their DNA? Yes, siblings can theoretically share more than 50% of their DNA. This is not very common, however.

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