Siblingship Testing
Do you want to know if you and your sibling share the same father? Or do you want to confirm a possible relationship discovered through ancestry testing? There are many reasons for doing a DNA siblingship test and Certainty DNA offers the latest technology and accurate testing to resolve questions about biological sibling relationships.
Why Siblingship or Twin Zygosity Testing?
The most common reason for taking a siblingship DNA test is to confirm whether you and your sibling share the same father. Other reasons to take the test are for medical history, social security benefits, inheritance claims, immigration cases, insurance claims
Results are completely confidential, and your private genetic information is never shared with or sold to outside parties.
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Yes, sibling DNA test results can be used for legal reasons such as immigration, Social-Security benefits, inheritance rights, and more, as long as you order a legal siblingship test with court-admissible results. A report for an informational siblingship test cannot be used for legal reasons.
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A siblingship DNA test starts at $300. Total cost depends on whether you need results for personal knowledge only or for legal reasons. A sibling test requires considerably more extensive analysis, which is why it costs more than a paternity test.
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If it’s unknown whether the possible sibling is a full or half, we first test to see if there’s a biological relationship. If there isn’t, the testing is over. But, if a relationship is determined then we can do a full-sibling test request of the customer. In case there might be a cousin relationship, the sibling DNA test is not the right test to do.
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Understanding results for a sibling DNA test is a little tricky, since there can never be a straight “yes or no” answer in relationship testing. Calculations for relationships such as grandparent, avuncular (aunt/uncle), and siblings all involve statistics, and a probability of relationship is given as a percentage in the report:
90% or higher: the relationship is supported by DNA testing
9% – 89%: inconclusive result, and additional parties need to be tested
Below 9%: the relationship is not supported by DNA testing
If a probability of relationship (PRI) of 92% is given for a full-sibling test, the result could be understood as: “There is a 92% probability that the persons tested share a full sibling relationship.” -
No, we cannot perform a sibling test if there might be a cousin relationship.
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Understanding results for a sibling DNA test is a little tricky since there can never be a straight yes or no answer in relationship testing. Calculation for relationship such as grandparent, avuncular (aunt/uncle), and siblings involve statistics, and a probability of relationship is given as a percentage in the report.
90% or higher: the sibling relationship is supported by DNA testing
9%-89%: inconclusive result, and additional parties need to be tested
Below 9%: the sibling relationship is not supported by DNA testing
If probability of relationship (PRI) of 92% is given for a full-sibling test, the result could be understood as: “There is a 92% probability that the persons tested share a full sibling relationship.”