Sibling DNA Test by Journey Genetic Testing

Sibling DNA Testing

What Is A Sibling DNA Test?

A sibling DNA test examines whether two or more people are biological siblings. It can identify if two people are full siblings, half siblings, or not related as siblings. This type of DNA test for siblingship is basically a paternity test without the biological father’s DNA sample. This DNA test is one recommendation when the suspected father is not available to take a paternity test. Perhaps the alleged father has refused to take the test, or it just isn’t possible to get his DNA sample.

Full Sibling or Half Sibling DNA Tests

When you’re full siblings, you share 50% of your DNA. If you have the same mother and want to know if you have the same father, choose a full sibling test. We suggest getting the mother’s DNA too, if possible. For a full sibling test, we use the mother’s DNA to remove her DNA from her children’s genetic profiles. This leaves only on the DNA passed down by the biological father, making the result stronger in some cases.

When checking for possible half siblings, we know they don’t share the same mother. We’ll study their DNA to see if they have the same father. Half siblings have around 25% of the same DNA. Like with full siblings, having the biological mother’s DNA can be beneficial. We remove her DNA from the child’s sample, leaving only the potential father’s DNA. Then we compare this DNA with the other possible half siblings.

At Home Sibling DNA Test Kit Or Legal Sibling DNA Test by Journey Genetic Testing

Sibling DNA Tests vs. Ancestry Tests

Many people consider having a sibling test done after getting results from an ancestry test. We strongly recommend verifying the information your receive. You may be suprised to learn that ancestry type tests are often wrong.

We have found over the years that almost 50% of the cases that want to prove that the information they received is correct, find out they are not related after all. Here is the reason for this: you can’t tell with 100% certainty if two people are related unless you compare the DNA for both people directly with each other. Since ancestry type tests use little pieces of DNA, and we all share 99.9% of the same genetic code, this means there is a high probability of error in those type of reports.

A DNA Sibling Test can prove or disprove ancestry results. Most ancestry companies can only say that you might have found a surprise sibling. Our can prove or disprove the findings in almost every case. However, you can get a 100% accurate answer concerning a sibling relationship with our home sibling kit.

Ancestry type tests are not AABB accredited due to the type of process they use. It is always best to verify a relationship before investing your time. and emotional energy, into a new situation.

How Accurate Is A Sibling DNA Test?

Journey Genetic Testing DNA Test Accuracy

We guarantee your results will be 100% accurate. Unlike other types of DNA testing, such as ancestry mapping, we compare each person’s DNA with each other. There are some DNA companies that state their testing is 99% accurate, rather than 100%. It is important to understand the difference. You should always have a test result that is as accurate as possible. Often these results are life changing.

We test a base of 24 genetic markers. In almost every case that is enough DNA to arrive at a conclusive answer. If we are unable to reach the strongest [possible result with our base testing, we will automatically upgrade your testing to include additional markers as the lab determines is necessary. There is no additional cost when you test is upgraded. Our goal is to always provide you with an answer that is 100% accurate to help you on your journey to truth.

DNA Testing Without The Other Person Knowing

Sometimes a discreet DNA test may be the right choice for you. We believe that open and honest communication is best, however if the other person is not available, or for other reasons you want to keep the testing very private, this may be the right option for you.

You can also perform rivate DNA test using alternative samples. Items such as earwax, hair, tissues with mucus, nail clippings, and toothbrushes can all be used for DNA collection. Click Alternative DNA Samples to learn more.

How Much Does A Sibling DNA Test Cost?

Private Sibling DNA TestLegal Sibling DNA TestAlternative DNA Samples
2 Sibling Test Participants2 Sibling Test ParticipantsUse For Secret Testing
Mother Included (Optional)Mother Included (Optional)Toothbrush, Hair, Nails, Etc.
Additional Siblings – $100Additional Siblings – $110Viability Testing Included
DNA Collection Kit IncludedDNA Collection Appointments IncludedDNA Collection Kit Included
Free Shipping Both Ways*Notarized Court Admissible ResultsMake Your Own Kit Option
Results In 2 Business DaysResults In 2 Business DaysResults In 2 Days After Viability
Guaranteed 100% AccurateGuaranteed 100% AccurateGuaranteed 100% Accurate
0% Interest Payments With Affirm0% Interest Payments With Affirm0% Interest Payments With Affirm
$129$299$100 Per Sample

Make Your Own Sibling DNA Kit

If you prefer not to receive a kit for privacy or other reasons, you can make your own kit (MYOK) with cotton swabs. We’ll email you a case number and step-by-step instructions to collect and send your DNA samples to our lab for processing. If you are in the U.S.A. we will also send you a pre-paid overnight return label. For more info, click on Make Your Own Kit (MYOK).

Our Sibling DNA Test will provide answers to the question if you are full siblings or half siblings. If you know you don't have the same mother, we can also prove if you are half siblings, having the same father. Journey Genetic Testing is here to help you on this journey of self-discovery in learning the truth through DNA.

  • You Will Have Access To Our Expertise: We are leaders in DNA sibling testing. Our Genetic Consultants have a deep understanding of siblingship and the latest advancements in DNA analysis.
  • We Guarantee Accurate DNA Results: Using the most advanced technology, our AABB parent lab will provide you with 100% accurate results. Your testing is performed twice to ensure your report is correct.
  • We Provide Everything You Need: Our kit is shipped USPS Priority and includes everything you need. We also include a pre-paid overnight return label for sending your DNA samples to our parent lab.
  • We Make Sure This Is An Easy Process: Our DNA test kit includes simple instructions for collecting your samples, making the process easy and stress-free.
  • Your Information Is Confidential: We know how sensitive personal DNA information is. This information will never be sold and will only be used to test for a sibling relationship.
  • You Will Have Personalized Customer Support: Our friendly and knowledgeable team is here to answer any questions you may have along the way.

Step-By-Step Directions

The mouth (buccal) swabs are packaged in sterile packaging. You will have two packets. Each packet contains TWO swabs. You will use all 4 swabs for each person.

Step 1: Complete the information on the DNA collection envelopes. The names listed should be the same as you put on your order form. There will be one collection envelope for each person whose DNA is being collected.

Step 2: Open the paper packaging and remove the swabs. Please be careful to handle the swabs on the long handle (the non-cotton end) only. DO NOT, at any time, touch the cotton end with your hands or fingers.

Step 3: With clean dry hands, collect cheek cells by rolling the tip of the sample collection swab firmly on the inside of the right cheek and under the tongue for 20-30 seconds. Be sure to roll the swab over the entire inner cheek surface. Repeat this process for the same individual with the second swab. You should use two swabs on the inside of the right cheek and two swabs on the inside of the left cheek.

Repeat the process for every individual being tested using a different set of swabs and envelope for each person.

Step 3: The mouth swabs should be dry before putting them into the collection envelope. The best way of doing this without risking contamination is to place them in an upright position in a clean dry glass. Do not put more than one person's DNA samples into a glass at a time. The DNA samples of each person must never touch each other. Once they are dry, place them back into the correct envelopes.

Step 4: Place all of the swab envelopes, plus and any included forms that you have completed, into the large pre-paid FedEx return envelope. Then simply return them to a FedEx office or call FedEx to pick it up at a time that fits your schedule.

Journey Genetic Testing LLC

Complimentary Sibling DNA Consultations:
Monday-Thursday - 9 AM-4 PM PST. Friday - 9 AM - 3 PM PST.
Phone: 1-855-362-5224

Sibling DNA Testing Frequently Asked Questions

Here are the questions we are most often asked about siblingship testing. If you have questions that are not answered here, please reach out to us. We will always provide you direct and honest answers, and if we can’t help you, we may be be able to refer you to a company that can.

How Conclusive Are Your DNA Tests?

The results of a sibling test are shown as a probability percentage. This indicates whether the genetic profiles acquired can confirm the presence of a relationship. Results demonstrating a probability of 91% or higher are deemed as definitive proof that the relationship exists. Conversely, a probability of less than 9% establishes that the genetic evidence does not support the existence of the relationship.

Can DNA Tell Which Brother Fathered A Child With A Sibling Test?

The answer is “Yes” in almost every situation. A sibling DNA test can determine which brother is the biological father of a child, if you include the DNA of the mother. Every child has genetic contributions (46 chromosomes) 23 chromosomes from the mother and 23 chromosomes from the father.

Can Your DNA Test Prove We Are Half Siblings?

Yes, our DNA test can prove you are half siblings. In fact, DNA testing is the most scientific and accurate way to prove that two or more individuals are biologically related. Half-siblings share only one biological parent, either the mother or father.

Can I Use The Results In Court?

We offer AABB accredited legal sibling testing which is valid in cases for child support, parenting time, birth certificate name changes, probate, and wills, as well as many other legal circumstances. A legally admissible DNA test requires some extra steps, however the final results will be the same.

Can You Tell If We Are Half-Siblings Or Cousins?

It depends. Since half siblings share 25% of the same DNA, and first cousins share 12.5%. Depending on if a mother’s DNA is available to test as well, there may be other testing options that would give stronger results. In these situations we encourage you to talk with one of our Genetic Consultants at 1-855-362-5224, or email us at and we can offer advice on your unique situation.

Can I Test Something That Is Not A Mouth Swab?

Yes! Some commonly used items that are not a mouth swab include ear wax, hair (must have the root ball attached), mucous on a tissue, finger or toe nail clippings, and toothbrushes. You can learn more about these “non-standard” DNA samples by clicking on Alternative DNA Samples, or call us a 1-855-362-5224.

How And When Will I Be Receiving My DNA Test Kit?

If you place your order before 2:00 PM PST, we will ship the same business day. We will send you a sterile DNA collection kit by Priority mail and email you a USPS tracking number. We ship Monday through Friday to physical addresses in the USA. Orders received after 2:00 PM PST ship the following business day. Depending on your location, USPS delivers Priority mail within 1-3 business days.

How Fast Can I Get My Results?

Once the lab has all of the samples available for sibling testing, we will have the results for you in 2 business days in almost every single case. We perform all DNA tests for siblings twice, to validate the findings. We do not charge any extra fees for this service.

Do I Need A Mother’s DNA For An Accurate Answer?

You can still do DNA testing without a mother’s DNA. We can still proceed, but we might need to examine more genetic markers. We begin with 24 markers, but sometimes we use up to 46 for stronger results. We’ll determine the need to add markers during testing. Additional markers might take an extra lab day, but no extra charge. These added markers aim for the best results. Your results will be 100% accurate with, or without, the mother’s DNA.

Read Journey Genetic Testing’s Customer Reviews HERE or at DNA Testing Choice.