Legal Sibling DNA Testing $245
Quality Accurate Legal Sibling DNA Testing
A legal siblingship test is often referred to as a legal sibling paternity test. Legal sibling DNA testing is a DNA comparison performed to determine a brother/sister relationship for individuals who want to find out if they have one, both or no parents in common. This DNA test will determine a statistical probability of the test participants sharing a biological relationship as that of siblings. The analysis can be performed with only 2 siblings however it is strongly recommended to add the known mother(s) to the test to make sure your result is the most conclusive. You may also add additional siblings to compare.
RESULTS FROM OUR LEGAL SIBLING DNA TESTS ARE VALID AND ADMISSIBLE IN COURT IN ALL 50 USA STATES.
How to Increase the Accuracy of Your Sibling DNA Test
A sibling DNA test can be performed with only two or more siblings, however adding any known parent(s) to the test is strongly recommended to increase the level of conclusiveness.
Each person has genetic material from both parents in their DNA profile. Half of the genes will come from the mother and half from the father. We are not able to distinguish which genes come from which parent. In a scenario where the siblings would like to determine if they have the same father and the known mother(s) take part in the test, her genetic profile is compared against her child. Then, all the DNA inherited from the mother is eliminated, and the DNA from the father is isolated. With the paternal DNA positively identified, it will more precisely match (or not match) the other alleged sibling’s paternal DNA resulting in a more accurate and conclusive siblingship test result.
If no known parent(s) can be added to the test, we recommend the option to test additional markers as needed. This ensures you get the most conclusive result possible based on the DNA that is available.
Our 34 Marker Test
$125
24-34
Marker Count
FREE
mom inclusion
High
Conclusiveness
FREE
2-Way Shipping
Our 46 Marker Test
$175
46
Marker Count
Extra Fee
for mom inclusion
Highest
Conclusiveness
FREE
2-Way Shipping
Typical Competitors
Up to $299
16-22
Marker Count
Extra Fee
for mom inclusion
Variable
Conclusiveness
Variable Pricing
on 2-Way Shipping
The Legal Sibling DNA Testing Process
The legal DNA testing process is quite simple. When you place your order you may choose to use our professional collection service (at one of our network clinic locations) or have a test collection kit shipped for free to your doctor’s office.
1
Place Your Order & Select Collection Method
Begin your legal sibling DNA test by ordering online or by phone and choosing between professional collection at a clinic or having a kit shipped to your doctor’s office.
2
Schedule & Complete Sample Collection
If using your doctor, confirm their participation and we’ll send a chain-of-custody collection kit with a prepaid return mailer. If you choose our service, we’ll schedule your appointment at one of 4,000+ clinic locations based on your availability.
3
Samples Sent to Lab & Testing Begins
After collection, all samples and documentation are sent directly to the laboratory. You’ll receive an email notification once your samples are received and testing is underway.
4
Receive Notarized Legal Results
Once testing is complete, results are emailed as a PDF (if selected) and a notarized hard copy is mailed to the billing address. No materials are shipped to you other than the official results.
Why We Stand Above the Others
Smaller companies who advertise cheap DNA testing allow participants to choose their own collector. Surprisingly, they even mail the collection kit right to the client. Please beware – this practice does not follow AABB chain of custody requirements. Their cheap sibling DNA test can end up being very costly to your family down the road.
It’s a direct violation of AABB requirements for anyone associated with the legal sibling test to be in the possession of the collection kit. This includes any test participant, family members or friends. When collection swabs have been in the possession of someone with an interest in the test result, there could easily be suspicion of tampering. For this reason, we never ship a legal DNA collection kit to anyone other than a doctor’s office or clinic performing the sample collection.
Secondly, a legally binding sibling test must be collected by a medical or clinic professional. With PaternityUSA.com, you can use your doctor for the DNA collection or opt for professional collection service at one of our more than 4,000 network clinic locations. Again, having someone known to the test participant act as a collector, or “witness” the DNA collection, does not meet AABB standards. A collection by an associate, friend or family member can easily be discredited; causing you to have to pay for another test.
A legal test conducted outside of the chain of custody is easily contested and disputed in court; and more importantly will not stand up as evidence.
In contrast, we don’t bend guidelines and risk injuring your case. The accredited lab we work with follows every AABB requirement to help ensure your result stands up in any legal matter facing your family. We understand the need for a legal DNA test is usually accompanied by an emotionally taxing burden. With that in mind, we handle every case with care and confidentiality.
What Makes a Test Legally Admissible?
The AABB guidelines stipulate that legal sibling testing must have a valid chain of custody to be admissible in court or accepted for use in any legal matter. Chain of custody, simply put, refers to a DNA collection in the presence of a medical professional and the legal identification and consent of the test participants. In any legal siblingship test case, a neutral medical professional who is not involved with the outcome of the test must perform the sample collection.
Our partner lab is staffed by top-notch PhD geneticists who oversee all tests using the most advanced, state of the art testing technology. In reality, many smaller labs are not really AABB accredited; they only claim to be. They sell you a legal DNA test, then when samples are sent in, they forward them to another lab (of their choosing) for processing. This extra step takes longer and risks the viability of your DNA. With PaternityUSA, your test samples go directly from the clinic to our AABB accredited partner laboratory.
Half Sibling DNA Testing or Full Sibling DNA Testing
A full sibling DNA test will assume there is one known parent in common and test to see if both parents are shared. The half sibling DNA test analysis will assume one parent is different and test to see if one parent is shared. If you are not sure whether the mother and or father are shared, performing both a full and half sibling test will give the most complete picture of the relationship and let you know whether one, both or no parents are in common with the other tested individual(s).
We Also Provide Informational Sibling DNA Testing
While a legal sibling test results are court admissible, you may simply need a test for your own peace of mind. In this case, our informational sibling DNA test may be best. Whether you choose legally binding or informational sibling DNA testing, rest assured that you are in good hands with PaternityUSA. All sibling test samples are processed using the same strict protocols for legal purposes and personal information. The difference lies only in the chain of custody sample collection method.
Other relationship tests may also help establish paternityor maternity, such as an avunculartest, a grandparentagetest with one or both of the alleged parent’s biological parents or a Y-STR analysis with 2 or more tested males. If more than one paternal family member is available, you may want to consider a Family Reconstruction test.
DNA Collection
The collection process is very simple. DNA is collected through a cheek swab, also known as a buccal swab, which is painlessly rubbed against the inside of the cheek. All sibling DNA tests are ran twice. For this reason, we collect multiple swabs per person. As a general rule, be sure the mouth is clean before swabbing by rinsing with water. Test participants should refrain from drinking coffee or tea or smoking for 1-2 hours before the DNA collection.
In cases where a family member may be deceased, depending upon the details surrounding the case, tissue or blood samples from the medical examiner or coroner’s office may be available. Their office should be able to advise you of what is preserved. Once you have established this information, call us to speak with a Case Manager to discuss your situation and how to proceed.
Fully Accredited USA Lab
All legal sibling tests are performed in our partner AABB-accredited USA lab by PhD geneticists with 20+ years of experience. CLIA-certified for reliability, and AABB accredited for court admissibility. Moreover all legal DNA tests adhere to AABB Standards for Relationship Testing Laboratories (17th edition effective January 1, 2026).
Legal Sibling DNA Testing Reviews
For over 25 years, families across the United States have trusted PaternityUSA for reliable DNA testing and knowledgeable client support, serving hundreds of thousands of clients nationwide with fast, confidential results.