DNA Sibling Test

Private Knowledge Siblings tests from $150 and Legal Sibling tests from $255
The DNA sibling test is recommended for situations where the alleged father/parent is not available for testing. The DNA sibling test will provide the likelihood that individuals are full siblings (same mother and father), half siblings (only one common parent) or not related at all (no common parents). This test is usually ordered by individuals wishing to determine whether two individuals have the same father but the father is deceased, unavailable, or un-willing to take the DNA paternity test.


Need a legal test? Legal testing starting at $230.


Important! Please note that the DNA sibling test is not as powerful as a DNA paternity test/parentage test. If the alleged parent(s) in question is/are available for testing, we highly recommend the paternity test or maternity test over the sibling test. The DNA paternity and maternity tests will always provide absolutely conclusive results. The sibling test should only be chosen if the parent in question absolutely cannot be tested. If you decide to proceed with a sibling test in order to find out whether two siblings with the same mother also have the same father, we highly recommend adding the mother to the sibling test in order to increase the power of the test. The sibling test results will provide a likelihood ratio of whether the alleged siblings are full siblings, half siblings or not related.


  • All sibling tests are conducted using a premium 16 genetic marker system
  • State of the Art Accredited testing laboratory utilizing advanced robotics and analyzers
  • Useful for situations where the the alleged parent is not available for testing
  • Check the progress of your sibling test online
  • Results in 3 to 5 business days as soon as the samples are received
  • Choose to receive your sibling test results report rapidly by email and/or mail
  • Discreet
  • Easy and painless sample collection using buccal (mouth) swabs

Private Sibling Test

The Private Sibling test is for families wishing to take the test discreetly for non-legal use. If you choose a Private Knowledge Sibling test, discreet collection kits containing buccal (mouth) swabs will be delivered to your address for simple, painless sample collection. The samples are collected by rubbing the provided swabs inside the mouth along the cheek and then sent back to the laboratory for analysis. Results will be available 3 to 5 business days from the date the samples are received at the laboratory.

Legal Sibling Test

The Legal Sibling Test is for individuals who need to receive legally admissible documents for use in court. Legal sibling testing requires a chain-of-custody procedure to be followed during sample collection by an unbiased third party collector/collection site. If you choose the legal test, you cannot collect the samples yourself. You will need to attend an appointment for chain-of-custody sample collection. This ensures proper witnessing, verification of identification and fingerprinting of the individuals involved in the test. Results will be available 3 to 5 business days from the date the samples are received at the laboratory.


Here are the answers to the most frequently asked questions about this test.

More Questions »

If the individuals to be tested live in different cities, or even different countries, we can split the kit and send each component to a different address. Since the kits are individually barcoded, the samples will still be tested together even if the are sent back separately. To order a split kit, please write the following into the comments box of the online order form “Please split kit”. Please also indicate the name and address to send each component. For example, please state “send the first sibling’s portion to… (specify the first sibling’s name and address)” and “send the second sibling’s portion to… (specify the second sibling’s name and address).

To proceed with DNA sibling testing, select the test option from the order list above. If you select the private DNA sibling test option, a private kit will be sent to you immediately for sample collection. If you select the legal DNA sibling test option, you can choose to arrange your own chain-of-custody sample collection or you can choose to have your samples collected at one of our hundreds of collection locations nation wide.

Sibling testing is completed in less than 3 to 5 business days. Once your test is complete, your results report is released to you immediately without delay.

You can choose to receive your sibling test results by email, mail or both. If you choose the email option, you will receive your test results by email instantly once the test is completed.

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