Full Or Half Sibling DNA Test $135

Do You Need To know If You’re A Full Sibling, Half Sibling, Or Not Related?

We offer affordable Sibling DNA Tests (Up To 35 Markers) from the most accurate & trusted USA lab!

What Is A Sibling DNA Test?

Sibling DNA testing analyzes the probability of brothers or sisters sharing one or two parents to determine if the siblings tested are full or half siblings. A Sibling DNA test can help prove or disprove the paternity or maternity  indirectly when the alleged father or mother is unwilling or unavailable to be tested.

Our sibling DNA test is a perfect solution to confirm or deny Ancestry.com ®, 23andMe.com ®, or MyHeritage.com’s ® genealogy test results when they indicate they you may have found a lost sibling. Our results will conclusively show if the sibling test participants are full siblings (both parents in common), half siblings (one parent in common) or not related.

Our sibling DNA testing service can analyze more markers (Up To 35).  That’s almost 150% more markers than the standard 16 marker sibling test and almost 50% more markers than the 24 marker sibling DNA test offered by many competitors.  The more DNA markers tested, the more accurate the sibling test results will be.

Very Affordable Sibling DNA Testing – FREE 2-WAY RUSHED SHIPPING Fast, Accurate, Dependable Results

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Why Buy Your Sibling DNA Test At PaternityUSA.com?

With so many choices on the Internet, which lab should you trust for answers?  Simply put, our lab is the largest, most reputable, and trusted DNA testing lab in the USA. This may be the most important test you buy; rest assured you can buy at PaternityUSA.com with confidence. Here’s why:


Our DNA laboratory performs 3 of 4 private sibling DNA tests in the USA. AS SEEN ON TV shows like Maury®, Steve Wilkos® & Paternity Court®. Our half and full sibling DNA test provides 100% Accurate Answers!

Most Trusted & Accurate Sibling DNA Tests In USA


Our DNA lab is fully accredited. Our sibling DNA test analyzes more markers (Up To 35), utilizes the most advanced testing methods, and produces 100% accurate results in your home or a court of law.

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Lab Accreditations


FREE USPS RUSH DELIVERY of DNA collection kits with FREE rush return delivery. And, sibling DNA results can be ready in 1-day. Some entities want you to prepare your own kits, but Don’t Risk Compromised DNA.

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Determine The Truth


We provide only high quality premium sibling DNA tests at very affordable prices. Don’t risk false or inconclusive results by buying from a small and unproven DNA testing lab. Our lab performs all our own sibling tests in-house.

The Only Thing Cheap About Our Sibling Test Is The Price

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Full Siblings – Half Siblings – Not Sure If Related

Full sibling DNA testing assumes there is one known parent in common and analyses to conclusively determine if both parents are shared.

Half sibling test assumes one parent is different and will determine if one or no parent is shared. If you are not sure whether the mother and or father are shared, performing both a full and half sibling analysis gives the most complete picture of the relationship.

The DNA analysis for both full and half siblings will let you know whether one, both or no parents are shared with the other tested individual(s). A sibling DNA test may provide the answers you seek.

Want More Conclusiveness?

Generally, a sibling DNA test can be performed with only two or more siblings, however adding any known parent(s) to the analysis is recommended to increase conclusiveness. You can add one mom AT NO CHARGE , and we now offer a 1-day analysis option, when you call us at (877) 786-9543.

Furthermore, if no known parent(s) can be added to the DNA analysis, we recommend you consider the option for analyzing additional markers to ensure you get the most conclusive results possible.

Options and Pricing

Testing Process Is Easy:

Upon receipt of order, we will rush a sterile collection kit FREE of charge.

Sample Collection:
Sampling is done through a cheek swab, which is also called a buccal swab.

Sample Analysis:
When all samples are returned to lab, you will be notified via email that the testing has begun.

Results Reporting:
Results are emailed to the address on file. If ordered, hard copy results are mailed to the billing address unless otherwise noted.

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Can you also test other family members?

A grandparent analysis can be performed with an alleged grandparent(s) and grandchild. If a full brother-sister of the alleged parent is available, you may also perform an (Aunt/Uncle) avuncular analysis. Lastly, you may also perform a family reconstruction analysis if multiple paternal relative are available.

Other types of genetic samples:

Ear wax, hair (w/ root ball), mucous on a tissue, finger or toe nail clippings, and toothbrushes are common forensic samples. Please contact a DNA Case Manager for additional information & pricing at (877) 786-9543.

Non-Legal Sibling Legal Sibling

Click On The Question

Sibling DNA testing analyzes the probability of rather alleged brothers & sisters share one or two parents in common. This will conclusively determine if they are full or half sibling to thus proving or disproving paternity.

Yes, in-fact unless the tested siblings are identical twins all siblings have unique DNA profiles. We get 50% of our DNA from our biological father and 50% from our mother. All brothers and sisters are made up of a unique blend of those DNA profiles received by both parents.

Identical Twin share 100% of the genes
Full Siblings share 50% of the genes
Half Siblings share 25% of the genes
1st Cousins share 12.5 % of the genes

In a full siblings test it is assumed that the tested brother & sisters share the same mother, but need to confirm that they also share the same father. Whereas, in a half sibling test it is known that the tested brother & sister DO NOT share the same mother, but want to verify that they do share the same father. When the status of the known parent is unknown such in the case of an adoption, we can perform both a full sibling and a half sibling DNA test.

If the tested siblings are male, a Y-STR analysis is a good option to consider. The Y-STR male line anakysis compares the Y-Chromosome every father passes to his child. This Y-STR is very unique, similar to a fingerprint. When the Y-STRs of the males are compared, the result will be a precise a “Yes” or “No” answer to the question of whether or not the two males come from the same paternal line.

Likewise, an mtDNA female lineage analysis provides a conclusive answer regarding a relationship on the maternal side.

When two people have related mothers and want to see if they have the same father, or believe their fathers could be related, sibling DNA testing may not produce the most accurate result if there is a cousin relationship in the case. In this testing scenario, a paternity or maternity test with the parent in question would be the best solution. Other test options may be a male lineage Y-STR males, or an X-SV female lineage to look for a common female line. Please call us at toll free (877) 786-9543, and a case manager can help guide you to the best DNA test for the most accurate result.

The avuncular test may only produce an accurate result report with an aunt or uncle who is a full sibling to the alleged father, meaning they share the same mother and father. If a grandparent or other relative is available, testing with them instead may be a better option. Please contact a case manager at (877) 786-9543 for more information.

In a matter as important as a sibling DNA test, especially for court-admissible cases, it is never good to leave room for doubt. Ideally, if you are performing a sibling DNA test, the known parent(s), usually the mother or mothers, should be tested. A child receives half of their DNA from their mother, and the other half from their father. Having the mother in the test allows us to eliminate the maternal DNA, or DNA from the mother. The remaining unmatched DNA will then be known to be that of the biological father. In so doing, the test will produce a more precise result. In general, if the mother is available for testing she should be included. In any event, the sibling test can still be performed without the inclusion of the mother if she is not available. IF THE MOTHER(S) IS NOT AVAILABLE, YOU MAY CONSIDER RUNNING THE EXTRA MARKERS (Up to 35 markers)

YES! However, our mission is to first provide the most reliable & accurate results at the cheapest prices, and as quickly as possible. That’s why our lab is featured on many TV shows, and is trusted worldwide to provide 100% accurate results. Some promise one day results, but in reading the fine print, their disclaimer says it can take 3-5 days.

Having said that, we do offer a 1-day processing option if at least 1 mom is included in the test. Without any of the mom’s DNA it may be very difficult to achieve a 99%+ results in just 24 hours. We can however still deliver results in 2-3 days typically. This is still a fast testing option while analyzing many more DNA markers. (Please call to request 1-day service option)

Fast 1 day results are no good if it produces a weak percentage of probability.

We understand that speed is often a very important factor. Also, we value our clients very much, and know how easy DNA cross contamination can occur when using an open air q-tip. Therefore, we to try to not have you make your own collection kit. The swab, similar to a large Q-tip, is painlessly rubbed against the inside of the cheek to collect skin cells from the inside of the mouth. All analysis are performed twice. For that reason, there will be 4 buccal swabs per person in your collection kit. Do two swabs on each side of the mouth. For best results, rinse the mouth with water prior to swabbing; also refrain from smoking or drinking coffee or tea for 2-3 hours before the DNA collection.

For this reason, PaternityUSA will deliver a medically sealed sterile kit to you FREE.

Sometimes the situation dictates that you have to do the DNA collection right away or lose the opportunity to obtain a sample from that person. In such cases, you can use regular cotton swabs for the DNA collection. Please note that this is not the recommended procedure, and should only be used in circumstances where you may not be able to swab at another time.

There are times when a participant is unable to submit a swab. Ear wax, hair (must have the root ball attached), mucous on a tissue, finger or toe nail clippings, and toothbrushes are commonly used forensic DNA samples. For pricing and more details on this process, please contact a DNA Case Manager at (877) 786-9543.

Upon receipt of order, we rush a sterile collection kit via USPS for FREE Monday through Friday to physical addresses in the contiguous USA. Orders received and processed by 2:00 PM EST are shipped the same business day. Orders received after that time will ship the following business day.

If participants are in different cities or states, when ordering, simply provide the additional address, and we will send the other participant a separate collection kit. The DNA samples are then linked through reference numbers and bar codes when they arrive back in lab. Please note the additional collection kit will be delivered in the same manner as the main test kit.

YES, our legal packages can be used as admissible court approved evidence. Our legal results are valid in cases for child support, visitation rights, to change name on the birth certificate, estate, wills, probate situations, and/or any other type case where proving the relationship is required.

If you need your sibling DNA test results for any domestic legal proceedings, then order the accredited legal sibling DNA test kit.

Further, if you need the DNA test results for immigration, CRBA, passport, the embassy, USCIS/ICE or Dept. Of Homeland Security as DNA evidence of the biological relationship, then order the immigration package.

We Look Forward To Serving You!

Immigration Client

Thank you for your immediate and prompt service...Highly recommendable for people wanting to provide proof to the USCIS...Good job Paternity USA...Again thank you so much. Another VERY HAPPY customer 🙂

G.B. - Immigration Client

Steve S - Home Paternity

We just did a paternity test and used our doctor as the collector - the process was easy, legitimate and cheap! I highly recommend for those of us on a budget!

Steve S - Home Paternity Test

Eric M - Legal Paternity

Awesome. Easy. Best Price Around! Got my son's birth certificate right now. Thank you all!

Eric M

Tom - YSTR Male Line

I purchased this Y-STR test to verify that my son is the father of my grandson. Now I know for sure this sweet little boy is my son's baby. Thanks Paternity USA for the peace of mind.


Lockhart - Sibling Test

I took this test last month and my results were accurate. Easy process, good customer service and i like that they notified me of the status of my case all along the way. I always wondered and now I finally know for sure. I highly recommend you all every chance I get. Lisa L

Lisa Lockhart

Nguyen - Immigration

I picked paternity usa for my immigration test for my mother and sisters. I'm so glad I did. Everything great - very good service and fast.

T. Nguyen

Brenda - Half Sibling Test

I wondered at first, because they are cheaper than everyone else, and felt I shouldn't skimp on this. I didn't skimp - I just found the best deal! My test result was very definitive and left no room for question. Pick Paternity USA, they will do a great job. I can't say enough good about them!

Brenda Leighton

J Luna - Legal Paternity

I'm so glad I chose this company for my legal paternity test. They scheduled an appointment for me and my daughter within two days, and the whole process was complete within a week. I didn't have to do anything but show up for the appointment - they handled it all.

J Luna

Jenn - Home Paternity

Thank you guys for a process that is easy and quick. You've been so helpful! Jenn


mtDNA Female Line

I was given up for adoption and later found a possible sister. We did a mtDNA test to see if we have the same mother, and I finally connected with my family. I will always have my adoptive family, but it's nice to add to that! The process was easy and the service was great! 🙂

mtDNA Tester

Claitte Family Immigration

The immigration process was a hard process for me and my family and PaternityUSA has experience and was able to help us through the whole thing. Happy with your service and I will let my friends know. Sincere thanks - the Claitte Family

The Claitte Family

Juanita - Grandparent

I called PaternityUSA to help us with getting my grandchildren in from Jamaica, and so they performed the AABB accredited DNA testing for immigration. The process only took (2) weeks, and everything was very smooth. I cannot thank these people enough.


Peter Johnson - Grandparent

I had bought a DNA kit at CVS pharmacy, but I wanted to see if I was the grandparent. I discovered that I could not use the drug store kit for grandparent testing. I called paternityusa, they were able to use the kit I bought, and I'm very pleased with the work they performed.

Pam Johnson

Rick Davis - YSTR Male Line

I found my long lost brother after 40 years separation at birth. We did a y-str test, and it was very accurate. I happy to have my brother in my life again

Rick Davis

Sally Valega - Avuncular

This company did a wonderful job for our family, and we're so grateful we were able to find them on the internet. THANKS!!

Sally Valega

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Choose the type of relationship that you need DNA answers for, and who is available to do the testing.


Decide if you need answers for just personal knowledge or if you need answers for court or other legal matter.


Place order online on our secure shopping cart with credit card or PayPal. The test kit is delivered right to you.

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