Relatedness

1 - 10 of 57 Answers

May 6, 2019: Two of the characters on Game of Thrones are full siblings. They committed incest and have 3 children together. With just that information what percentage of DNA would the children share with each other? And what percentage would they share if their parents were only half siblings?
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April 2, 2019: I learned through 23andMe that I have a half-sister. However, my father was an identical twin, so this woman also matches with my cousin as a half-sister. Both twins are deceased. Is it possible to solve the mystery of which twin is actually her father?
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February 19, 2019: I have two half-siblings and share DNA with one at 28.7% and the other at 24.6%, which I assume is normal.  However, according to the 23andMe, the brother sharing the most DNA shares only 47 segments versus 55 segments with the other brother.  Is this also considered normal?
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November 29, 2018: How exactly do paternity tests work?
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January 8, 2018: What is the best genetic test for telling whether my brother is a full or half-brother?
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November 9, 2017: My husband just learned who his birth parents are. Unfortunately both are deceased. The birth father’s family wants my husband and the last surviving sibling (an aunt) to be tested to make sure the birth mother named the right guy! I understand the test they need is called an avuncular test. Is there a specific type of lab that we can use to make sure they are testing enough and properly to try to achieve the most conclusive result, whichever way that goes? There are so many types of labs on the web...
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August 2, 2017: My brother and I recently used the DNA testing company MyHeritage and the results said we shared 38% of our DNA. We are confused because we thought full siblings shared 50% and half siblings shared 25% of their DNA. Why are we right in the middle?
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January 17, 2017: How likely is a test from 23andMe or Ancestry.com to see if two people are third cousins? What about fifth cousins?
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January 4, 2017: Is there any way to tell if someone is the product of incest like father/daughter by just looking at their DNA? Not testing the parents?
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June 15, 2016: Can my brother's son (my nephew) and I share less than 25% DNA? We were both tested and it shows us sharing 16% of our DNA which the test says makes us first cousins.
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