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Can 23andMe distinguish half vs. full sibling relationships?

23andMe is preparing to transition customers to an updated version of the 23andMe experience.

New 23andMe Experience | Old 23andMe Experience

New 23andMe Experience

If you and your sibling have both been genotyped by 23andMe, there are two features in particular that will help you to identify whether and to what degree you are related each other.

DNA Relatives

This feature locates other 23andMe members that match your DNA. We sort people into likely relationships based on how much DNA is shared. When two people share identical segments of DNA, this indicates that they share a recent common ancestor. The 23andMe DNA Relatives feature uses the length and number of these identical segments to predict the relationship between people.

Your relationship to your siblings would be labelled as "Siblings" if full or "Half-siblings" if partial.

Full Siblings Half-Siblings
Full_vs_Half_-_predicted_relationship.jpg
Share and Compare

First, share your profile with your sibling(s) from the Manage Your Connections page. Then compare your genome to that of your sibling(s) using the 23andMe Share and Compare feature. Full siblings will have some fully identical regions (purple) and some half-identical (pink) regions. Half-siblings will only have some half-identical (pink) regions.

Full Siblings Half-Siblings
full_vs_half_-_share_and_compare.jpg

 

Old 23andMe Experience

If you and your sibling have both been genotyped by 23andMe, there are two features in particular that will help you to identify whether and to what degree you are related each other.

Family Traits

First, share your profile with your sibling(s) from the Manage Sharing page. Then compare your genome to that of your sibling(s) using the 23andMe Family Traits feature. Full siblings will have some fully identical regions (dark blue) and some half-identical (light-blue) regions. Half-siblings will only have some half-identical (light-blue) regions.

Full Siblings Half-Siblings

 

DNA Relatives

This feature locates other 23andMe members that match your DNA. We sort people into likely relationships based on how much DNA is shared. When two people share identical segments of DNA, this indicates that they share a recent common ancestor. The 23andMe DNA Relatives feature uses the length and number of these identical segments to predict the relationship between people. 

Your relationship to your siblings would be labelled as "Siblings" if full or "Half-siblings" if partial.

Full Siblings Half-Siblings
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