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I have 2 alleged fathers and have recently ruled out one of them with a private DNA test. I am now trying to determine whether the other is my father but he is deceased, so I am testing with one of his daughters.

We used a Sibling DNA Test and received the results back yesterday, but I don't quite understand them.

How do I determine whether we are a match?

My results show we have:
COMBINED SIBSHIP INDEX (HALF-SIBLING): 0.15, PROBABILITY: 13.6%.

Can anyone make any sense of this?

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    When you say 'Private DNA-test' do you mean a paternity test rather than a genealogy dna test? – ColeValleyGirl Mar 15 at 13:50
  • Yes but not Paternity - I did a Sibling DNA Test. – Michelle Mar 15 at 14:27
  • Welcome to Genealogy.SE Michelle. – Cyn Mar 16 at 0:53
  • I answered the question below though in a sense it's really more comments (but too long for comments) because there's too much I don't know about your setup. – Cyn Mar 16 at 0:59
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You need to tell us the company and type of test. Paternity tests (and the similar "sibling tests") are not used for genealogy and aren't anything we do here. What the test results mean depends entirely on the company that tested you.

Given how cheap they are now, I think you're much better off with one of the genetic genealogy tests. It also makes it very easy to compare yourself with other people who have tested, both people you might have used the sibling test for or random strangers that turn out to be related to you.

The primary companies are: 23andMe, AncestryDNA, FTDNA, and MyHeritage. They each have sales often.

If you were not related to this woman, your results would show zero. Because you did not supply the name of the company (and I wouldn't be familiar with it anyway, as it is not genealogy), I don't know if 14% probability means she is more likely to be your niece or your cousin, or if that's what they expect half siblings to show. Read their FAQs and ask them if you're still unsure.

If you test with a genetic genealogy test, please return to ask about that if you have any questions.

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A sibling DNA test from PaternityUSA.com analyzes the DNA of alleged brothers or sisters to determine if full siblings, half siblings or not related. Sibling tests can help prove or disprove the paternity or maternity indirectly when the alleged father or mother is unwilling or unavailable to be tested. This DNA test for siblings can analyze Up To 35 Markers, which is almost 50% more markers then competitor’s 24 marker DNA test. The results will show if the test participants are full siblings (both parents in common), half siblings (one parent in common) or not related as brother and sister. This is accomplished by actually comparing one alleged sibling against the other alleged sibling tested, and not just by using an ancestry database.

  • This answer is a word-for-word copy of several other answers, which implies self-promotion. To quote PolyGeo's comment: "The community tends to vote down overt self-promotion and flag it as spam. Post good, relevant answers, and if some (but not all) happen to be about your product or website, that’s okay. However, you must disclose your affiliation in your answers.](genealogy.stackexchange.com/help/behavior)." – DRShort Aug 2 at 11:45

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