Journey Genetic Testing is a leading provider of sibling dna testing services. We provide full sibling testing and a half sibling dna test with results in 2 days.

Sibling DNA Test – $129 – Results in 1-2 Days

Full Sibling DNA Test or Half Sibling DNA Test

A Sibling DNA test determines the statistical probability that two or more persons are or are not biologically related as full or half brothers and/or full or half sisters.  

This test is normally performed when a standard paternity test is not possible. The sibling test is the best way of establishing paternity through the alleged father’s suspected children. Our sibling paternity test will show the likelihood that two or more siblings are related through the same biological father.

Our sibling DNA test is the most accurate way to confirm, or deny, ®, ®, or's ® genealogy reports. These heritage and  ancestry companies use a limited database to indicate that you may have found a surprise sibling, but most importantly our testing can prove or disprove the findings in almost every case. Our private home sibling test uses 24  markers instead of the standard 16 markers, and if we do not have a strong enough result, the test will be upgraded automatically to examine up to 35 genetic markers. There is no additional cost to you for the upgrade. This makes our sibling DNA testing the most accurate sibling DNA test available.

Journey Genetic Testing's home sibling test uses the same standards, and produces the same type of results as our AABB accredited legal sibling test. We provide this service at the lowest possible cost to help as many people as possible learn the truth. 

There are two types of sibling DNA testing available depending on your situation.

Full sibling DNA test

What makes two children full-siblings or half-siblings is how much genetic information, or DNA, they share. Each of us gets half our DNA from our mother and half from our father.

Full siblings have the same mother and the same father. These siblings get all of their genetic information from the same two people, and they share 50% of the same DNA. 

Half sibling DNA test 

Half siblings only share DNA from one parent, usually their biological father, and share about 25% of the same DNA. Each person testing as a half sibling has a different mother. A half sibling shares the same percentage of DNA with their brother or sister as with a grandparent, or an aunt or uncle. First cousins share just 12.5% of the same DNA, second cousins 6.125%, etc.  Due to the high amount of DNA shared between half siblings and cousins, DNA testing cannot be used for sibling testing when this question comes up.

Sibling Testing FAQ's

Yes!  It is possible to have a DNA "paternity test" without the father's direct involvement by using possible or known siblings.

When it is known that both siblings have the same biological mother, then a Full Siblings vs. Half Siblings test should be done. In these sibling tests, the DNA of two individuals with the same biological mother is compared to determine the likelihood that they have the same biological father.

If you know that both suspected siblings do not have the same mother, you would want to order a Half Siblings vs. Unrelated DNA test to show that the siblings either share the same father or are not half siblings.

A mother's DNA may help provide a stronger result in some cases, and there is no charge for the mother's DNA if you include it when the samples are sent in prior to testing.

Full siblings share 50% of the same DNA, and half siblings share 25% of the same DNA.

Because of how DNA is passed on, it is possible for two siblings to have some differences at the DNA level. It is even possible for two siblings to get different "ancestry" results from some DNA tests. If the differences are significant however, you may want to consider verifying the sibling relationship.

Yes. In the event of siblings needing confirmation of their biological relationship, researching your family history will only tell you so much. In the absence of the biological parents for testing, the only definitive way to prove a biological relationship is through a DNA sibling test

The standard for sibling testing in the DNA industry is 16 genetic markers. Every marker tested in addition to that increases the power of the results exponentially. Our testing delivers results almost 1,000 times more powerful in the findings that the industry standard.

Each parent (mother and father) contributes 50% of their DNA to their children. When one parent submits a sample for testing, it allows the lab to "subtract out" that parent's DNA profile and focus only on the remaining parent's contribution.

If you are seeking to determine if your share the same biological father, the mother's DNA may be helpful for a stronger result.  97-98% of our cases arrive at a conclusive result without the mother's DNA. There is no cost to add one mother's DNA at the time of the original order.

One of the questions we're sometimes asked is whether or not a sibling test can distinguish between brothers who are both possible fathers.

In this situation the best option is to perform a paternity test between the alleged father and the sibling(s) in question. However, since brothers may share many common DNA markers used in paternity testing,  the laboratory may need to perform extra testing.

Like you, your siblings inherited 23 chromosomes from each of your parents. But because of DNA swapping, their chromosomes have a different combination of genes than yours. Yet on average, half of the genes are still the same.

Each parent shares half their DNA to each of their children. Each egg has half of the mother's DNA and each sperm has half of the father's DNA. 50% of the DNA is shared by siblings who have the same mother and father, and 25% of the same DNA when they share only one parent.

You can be certain the just because we have lower prices, that the quality of our testing service is the highest available in consumer testing.

We often ask why other companies charge so much for sibling tests. We are able to offer a more accurate sibling test, using more markers, at a lower price for two reasons:

Part of our Mission Statement as a company is to provide the most accurate DNA testing, at the lowest cost, to as many people as possible because we believe we have a responsibility to help people learn the truth without "breaking the bank." We accomplish this by working with a much smaller margin of profit over thousands of tests each each. We would rather do more tests at a lower cost that take advantage of those needing to have these life changing answers.

Once the lab has all of the samples available for sibling testing, we will have the results for you in 1-2 business day in almost every single case. We do not charge any extra fees for this service.

How much does a sibling DNA test cost?

A DNA test may well be the most important test you will ever take. We guarantee the highest quality testing at the most affordable prices. We process thousands of DNA samples every year for lawyers, physicians, adoption agencies, and private individuals.

The price for testing includes a Journey Genetic Testing DNA collection kit sent to you by USPS Priority mail, all collection materials, a prepaid mailer for returning your samples, all lab processing fees, and results from our AABB accredited DNA testing lab. If you do not want a kit sent to you for privacy or other reasons, we also allow the option to make your own kit and will email you a case number and step-by-step instructions for collecting and send your DNA samples to our lab for processing.

Cost Number of People Testing Processing Time
$129 2 siblings 1-2 Business Days
$129 2 siblings + one mother 1-2 Business Days
+$110 Each additional person 1-2 Business Days
+$125 Non-standard DNA Sample (per sample) 1-5 Business Days

DNA Sibling Kit

Our DNA testing kits for siblings include the following: USPS Priority shipping of the kit to you, detailed step-by-step instructions, sterile buccal swabs for each person taking the sibling test, collection envelopes, a sibling analysis form, and a prepaid overnight FedEx label and envelope (USA only for prepaid label).

We can send DNA sibling kits to multiple addresses. When ordering, select how many kits you need (one per address is recommended if you cannot get together to do your DNA collection). You will be able to list the names and addresses to send the kits to on the order form. They are each coded with the same case number to be matched in the lab. Each additional kit will be sent USPS Priority mail and include all collection materials and a prepaid return label (USA addresses only).

Collecting a sibling DNA sample

The most accurate method to obtain the necessary sibling DNA sample is to use a mouth swab, often referred to as a "buccal" swab, which is very similar to a "Q-tip" cotton swab, The swabs are rubbed on the inside cheeks of the mouth for each sibling (and the mother, if testing) for about 15 - 30 second per side. It is painless and quick.

Your at home sibling DNA test kit will have detailed step-by-step instructions on how to collect your swab sample. You can also read more about how to take a home DNA test by going to How To Collect A DNA Sample At Home.

When it is not possible to obtain a buccal sample voluntarily or if you wish to have sibling DNA testing to be done in a more discreet manner, we are often able to test items other than a mouth swab, known as non-standard, or alternative, DNA samples at a reasonable additional cost. To learn more about alternative DNA samples, please CLICK HERE.

For discreet, private sibling DNA testing, you do not have to obtain consent for testing for the DNA samples being submitted.  The results are only provided to the person who orders the test, unless specific written instructions to release the test results to other individuals is provided to us.

Make Your Own DNA Kit (MYOK)

All orders include a DNA collection kit sent to the designated address on the order form. We understand that you may be in a situation where you do not want anything being mailed to you, to allow additional privacy.

Journey Genetic Testing allows you the option to make your own testing kit when collecting and returning DNA samples to us. This option can save money on shipping a DNA kit to you,  as well as save you time as you can ship directly to us  without waiting for the testing kit to arrive.

To choose this option please select the "Make My Own Kit" option on the order form for the particular test you are seeking. 

Upon finalization of your order (during regular business hours) you will be e-mailed a submission letter with your unique Journey Genetic Testing case number and the address for mailing your samples. The processing of the samples is conducted in the same time frame as if you used one of our kits - in as little as 1 business days for paternity, maternity, sibling, grandparent, avuncular, and twin zygosity tests!

Non-standard samples being submitted must fit into a standard envelope. If necessary please trim the item to fit (for example a hat band, a piece of clothing with blood, etc) into a regular envelope while making certain the specific area to be tested is included.


It is strongly suggested that if you reside outside of the United States and wish to order DNA testing that you use this option as the most cost effective and time efficient method to get the answers you need and deserve.

Please note that we are unable to process any DNA samples without a Journey Genetic Testing case number. Samples that arrive without a case number will be discarded.

To learn how you can make your own private at home DNA kit please CLICK HERE.


Example of Sibling DNA Test Results

We know how important the results of your sibling DNA test is to you. Laboratory processing begins as soon as all DNA samples indicated on your order form arrive at the lab. You will be notified by email that testing is underway. In almost all cases we are able to deliver 100% accurate results in just 1-2 business days.

Sibling DNA test results are shown on a single page.

In full sibling DNA testing the results are based on a probability, or likelihood, that two or more siblings share the same biological mother and father. According to AABB standards, a conclusive range is a 90.9% or greater (all the way to 99.99%) probability of the tested relationship. Each sibling test result we do varies in the percentages listed, as no two siblings share the exact same DNA (except identical twins).

When the percentage derived from the laboratory shows a 9.0% or lower probability of the relationship (the lowest being 0%), the results show that the relationship of full siblingship is not supported by the genetic evidence from the DNA samples, so the likelihood that a half sibling relationship exists between the two siblings would be the finding.

Half sibling DNA testing also has the results are based on a likelihood that two or more siblings share either a biological mother (maternal half siblingship) or a biological father (paternal half siblings). As in full sibling testing, AABB guidelines show a conclusive range is a 90.9% or greater (all the way to 99.99%) probability of the tested relationship.  It is uncommon for the final result on an exclusion to be 0% as 99.9% entire human genome is shared by all humans, so a small percentage of probability may show even when the relationship does not exist.

Our Sibling DNA Test Reviews


Rated 5 out of 5
July 29, 2021

The team helped me clarify information I received from an ancestry test, and know I can be confident that I have a “new” sister


Journey Genetic Testing you are terrific!

Rated 5 out of 5
July 1, 2021

You delivered everything you promised. Can’t believe it only took you two days for the results!! Thank you, thank you, thank you!!


Great service! I would use you again!

Rated 5 out of 5
May 20, 2021

Found my half brother after all these years! This was so easy and fast, The staff was understanding and patient. Recommended to everyone!


I can't speak more highly about this company!

Rated 5 out of 5
April 2, 2021

Thanks to you and your staff for your care and consideration while processing these tests.
Your service has ended a 7 decade pain in my heart. To have the lifelong question answered with care and dignity is a gift.
I am forever changed.


If you wish to read additional reviews from some of our clients, please CLICK HERE.

Our sibling test is 1,000 times more powerful than standard laboratory or drugstore DNA testing kits!