sibling dna testing

What is Sibling DNA Testing?

A sibling test is a test that determines whether two persons share one or both parents. This testing option can be used when a father or mother is unavailable to participate in DNA parentage testing.


How to buy an At-Home Sibling DNA Test Kit?

In order to purchase a Home Aunt/Uncle DNA test order by phone at 973-609-5102 or purchase online by clicking one of the payment options below.

How much does a Sibling DNA Test cost?

At-Home Sibling DNA Test Kit costs start at $299.99.

Testing Options:

Half Siblings vs. Unrelated DNA Testing

This type of DNA test is recommended when the two alleged siblings are certain they share a common parent (normally, the mother. If this is your situation. We often recommend having the mothers of each sibling involved have their DNA samples collected if they are available.

Adding one or both mothers allows the laboratory to more accurately determine the possible relatedness or unrelatedness of the half-siblings.

Half Sibling vs Full Sibling DNA Testing

This type of DNA test is recommended for siblings who initially believed that they share one biological parent but believe they may share both biological parents. As with the example above if the common parent is available we recommend including the parent.

It is important to note, that each scenario is different. Please contact our office to learn more about your specific situation.

Full Sibling DNA Testing vs Unrelated

This type of DNA Test is recommended for individuals who believe they share the same biological parents.

People who have been put up for adoption often times use this specific type of DNA test.

Home DNA Test Kit Contents

1. Sterilized Cheek Swabs
– Each packet contains 2 swabs per person for sample collection.

2. Contact Identification Form
– A form to be filled out with the necessary contact and identification information.

3. Sample Collection Instructions
– Detailed instructions on how to properly collect cheek swab samples.

4. Prepaid Return Shipping Envelope
– A prepaid overnight FedEx envelope for convenient and secure return.


A legal sibling DNA test is DNA test that determines a biological relationship between two possible siblings.

Are my sibling DNA test results legally admissible?

Yes. All legal DNA results are legally admissible in court. The results can also be used for immigration evidence submission purposes. Below are other scenarios sibling DNA results can be used.

  1. Adoption
  2. Deceased father’s Social Security Benefits
  3. Add a name to a child’s birth certificate 
  4. Estate Cases

Contact our office at 973-609-5102 to schedule an appointment today in a city near you nationwide.

What is the method DNA sample collections for Sibling Tests?

The standard method of DNA collection is by cheek swab. Blood sample collection is another viable specimen collection option.

Both specimen collection options have the same accuracy to produce a DNA profile. The difference between the two is blood is invasive and painful.

Legal sibling (brother and sister) Test costs start at $499.99 and up. 


When will I receive my DNA results?

The turnaround time for results is 2 to 3 business days from the date the lab received all genetic samples.

Are Sibling DNA Test results accurate?

Yes. Sibling DNA Testing (Avuncular Testing) is performed with high accuracy, but it’s important to note that these tests are not as accurate as paternity or maternity tests.

Key points to understand:

  • Parents and children share approximately 50% of their DNA.
  • Aunts/uncles share about 25% of their DNA with nieces and nephews.
  • This difference in shared DNA affects the accuracy of the tests.

While the accuracy of the tested DNA samples is high, and all samples are analyzed by our AABB-accredited partner laboratory meeting industry standards, the nature of the genetic relationship impacts the overall test accuracy.

Are my test results private and confidential?

Yes. Your DNA results are kept private and will only be released to the parties involved with your DNA test.

In the event, the lab receives a court order will results be released to a third party but not before the customer has been notified. All DNA specimens are destroyed within 30 to 60 days.

How much DNA do siblings share?

Full siblings share roughly 50% of their DNA while half-siblings share 25% of the same DNA.  Parents and children share 50% of the same DNA.

Can DNA tell if siblings have the same father?

Yes. A sibling dna test can help to determine the probability of a paternal biological relationship between siblings.

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