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Sibling DNA Test

When a possible father is not able to provide a DNA sample, you can confirm paternity through a sibling DNA test instead.
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Discreet
Convenient
Over 99.99% Accurate
Affordable

What is a Sibling DNA Test?

DDC’s Sibling DNA Test can verify a biological relationship between a child and their full-sibling or half-sibling, providing the answers and peace of mind that you need. This test is often used to determine paternity in situations when the possible father is not readily available for testing. Siblingship tests that include a common mother can increase the probability of paternity.

Sibling DNA testing can also confirm potential relationships found through ancestry testing. Not sure if it’s your biological brother or sister? Order a test through DNA Diagnostics Center to know if you’re related.

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DNA Testing Options For Siblingship

DDC offers two different types of sibling DNA tests: legal tests and at-home tests.

Legal DNA Tests

This test offers court-admissible results. To ensure the proper chain of custody is followed, all tested parties are required to have their DNA samples collected at a certified facility like DNA Diagnostics Center, a hospital, medical office, or health department. The sample collector is also required to verify the identities of all tested parties through either government ID or other legal documents.

View legal DNA sample report

At-Home DNA Tests

This test does not offer court-admissible results. If you are seeking a sibling DNA test solely for peace of mind, you may want to consider an at-home test. At-home relationship testing is just as accurate; the DDC lab follows the same strict processes that legal tests require, the only difference being that sample collection occurs at home, unwitnessed.

View home DNA sample report

DNA Testing With Reputable Accreditations

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Accreditations apply to legal DNA tests under scope.

Reliable Sibling DNA Testing Through DDC

When you choose to work with a world leader like DDC for your sibling DNA testing needs, you can rely on the results. Our US-based laboratory holds the highest level of accreditations available, including AABB, CAP, and CLIA certifications.

Results in 5 Business Days

Once all samples arrive at the lab.

PhD-Reviewed Results

Our in-house experts ensure accuracy.

Team Support

Stay informed every step of the way.

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Over 30 Years of Experience in DNA Relationship Testing

AABB-Accredited

First and only test accredited by the Association for the Advancement of Blood & Biotherapies.

American Pregnancy Association

The only test endorsed by the American Pregnancy Association.

30 Years

Over 30 years of experience in DNA relationship testing.

How the Sibling Test Process Works

We make the sibling DNA testing process easy by offering flexible options that meet your needs. Our customer support representatives are available to help you every step of the way.

Give Us a Call

To start the sibling DNA testing process, call our experts for a no-obligation consultation. Our representatives can help you navigate your unique situation and determine which test (legal or at-home) best suits your needs.

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Collect the DNA Sample(s)

If you opt for an at-home sibling DNA test, we’ll send a complete kit right to your doorstep in discreet packaging. Simply collect cheek swabs (or other allowable sample types) from both tested parties, and return the samples in the prepaid mailer.

If you order a legal sibling DNA test, both tested parties can easily provide their DNA sample in-person at one of our 5000+ collection locations worldwide. Multiple appointments can be set up in different locations if necessary.

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Your Test is Carefully Processed

Our laboratory technicians carefully handle and prepare your DNA samples for processing. Every DDC relationship test that utilizes buccal (cheek) swab samples is run two separate times by independent teams. The results of your sibling DNA test are then reviewed by our in-house team of PhDs and your report is prepared.

Receive Your Results Online

Once the sibling DNA testing process is complete, we’ll send you an email that will allow you to log in to our secure website and view your results. Your test results are completely confidential, and your private genetic information is never shared with or sold to outside parties. See our privacy policy here.

We Are Your Sibling DNA Experts

For decades, customers have trusted us with over 20 million DNA tests. DDC performs thousands of relationship tests each year, including:

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FAQs About Sibling DNA Tests

Below are some frequently asked questions about sibling DNA tests.

How does this test work if it’s unknown whether the potential sibling is a full or half-sibling?

If it is unknown whether the potential sibling would be a full or half-sibling, DDC will first test to see if there is any biological relationship. If there is not, the testing is over. But, if a relationship is determined, then we can do a full-sibling test at the request of the customer.

Can a sibling DNA test be used to confirm a possible relationship discovered through ancestry testing?

Yes, a sibling DNA test can be used to confirm a possible relationship discovered through ancestry testing. The test analyzes specific DNA regions inherited from each sample provider’s parents, assessing genetic similarities and calculating an accurate probability of relationship.

How accurate is a sibling DNA test compared to a paternity test?

A sibling DNA test is just as accurate as a paternity test, but the conclusiveness of the results can have more variation. For example, the probability of a relationship between a father and child is almost always 99.9% or higher—or 0% if he’s not the father—but for a sibling DNA test, the probability of a relationship might be 91%, which is still considered a conclusive result. If both possible siblings have a mother in common, then including her in the DNA test will increase the probability of paternity if siblings are a match.

Can a DNA test for siblings be used for legal reasons?

Yes, a sibling DNA test can be used for legal reasons as long as a chain-of-custody procedure has been set up and followed. Results from a legal sibling DNA test are court-admissible and can be used for legal reasons such as Social Security, inheritance rights, immigration, custody, and more. Results for an at-home sibling DNA test kit cannot be used in court.

How much does a sibling DNA test cost?

The cost of DNA testing services may vary depending on whether you need results simply for personal knowledge (at-home test) or for court (legal test). It also depends on the number of tested parties, whether the mother is testing, etc. Please call our customer service representatives for a free consultation and quote.

How do I understand results for a sibling DNA test?

The probability of relationship (PRI) is given as a percentage in your sibling DNA test results report. You can interpret your results based on the following:

  • 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 a probability of relationship (PRI) of 93% is given for a sibling test, the result could be understood as: “There is a 93% probability that the persons tested share a full sibling relationship.”

Does including a shared mother increase the probability of a sibling-based paternity test?

Yes, if the goal is to confirm a common father with your possible sibling, then including a common mother is the best option. When two potential siblings and a mother are DNA tested together, then the probability of paternity is likely to be higher when siblingship is confirmed.

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Please call Call now: 1.877.241.6511 for international locations.

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