Sibling DNA Test
Fast, Accurate, and Confidential At-Home DNA Testing
A home sibling DNA test helps determine whether two individuals share a biological sibling relationship. This test is designed for personal knowledge and allows you to collect DNA samples at home and receive clear, confidential results without appointments or clinic visits.
Our home sibling DNA tests are accurate, affordable, and discreet, providing answers you can trust in sensitive family situations.
Discreet
Convenient
99.99% Accurate
Affordable
What Is a Home Sibling DNA Test?
A home sibling DNA test analyzes the DNA profiles of two or more individuals to assess the likelihood that they share a biological relationship. This test can help determine whether individuals are full siblings, half siblings, or unrelated.
Sibling DNA testing is based on probability and statistical analysis rather than direct inclusion or exclusion, as seen in paternity testing.
When Is Home Sibling DNA Testing Used?
Home sibling DNA testing is commonly used to:
Determine whether siblings share the same biological parent
Confirm or rule out a relationship discovered through ancestry testing
Explore family relationships when a parent is unavailable for testing
Gain clarity for personal or family knowledge
Including a known biological parent’s DNA sample, when available, can help strengthen the results.
What’s Included in Your Home Sibling Test Kit?
Each home sibling DNA test kit includes:
Sterile cheek swabs for each participant
Step-by-step sample collection instructions
All required documentation and labels
Prepaid return packaging
Secure laboratory DNA analysis
No blood samples or needles are required. Sample collection is painless and simple.
How Home Sibling DNA Testing Works
Step 1. Order Online
Order your home sibling DNA test online. Your kit is shipped in discreet packaging with no identifying labels.
If you are unsure whether a home sibling test or a forensic or legal test is more appropriate, our DNA experts can help guide you.
Step 2. Collect the DNA Samples
Collect DNA samples using a simple buccal (cheek) swab. Each participant gently swabs the inside of their cheek following the provided instructions. Samples are sealed and returned using the prepaid envelope.
Step 3. Receive Your Results
Once samples arrive at the laboratory, testing is completed promptly. Results are delivered securely by email within 1–2 business days and reviewed by experienced DNA analysts.
Understanding Your Sibling DNA Test Results
Sibling DNA test results are expressed as a probability:
Relationship Supported
Relationship Not Supported
Inconclusive
A probability of 90.9% or higher is generally considered supportive of a biological sibling relationship. Results below this threshold may require additional testing or the inclusion of another family member.
100% Confidential DNA Testing
We treat every client with care, respect, and confidentiality.
Private and discreet processing
Accredited laboratory testing
Secure result delivery
Affordable testing options
Your personal information and genetic data are never shared or sold.
We guarantee 100% confidentiality in regards to the results of your DNA test.
Private and Confidential
Accredited Testing
Quick Results
Affordable
DNA Testing With Trusted Accreditations
We partner exclusively with laboratories that meet the highest industry standards. Our laboratory partners hold accreditations from organizations such as:
Association for the Advancement of Blood & Biotherapies (AABB)
College of American Pathologists (CAP)
Ministry of Justice (MoJ)
Multiple other regulatory bodies
Need help choosing your test?
The Best DNA Testing
Professional Support
Stay informed at step of the process.
Results in 1-2 Business Days
Once all samples arrive at the lab.
Quality Control
Our experts ensure accuracy.
Three Easy Steps to Get the Answers You Need
Order Online
Order your home sibling DNA test online. Your kit is shipped in discreet packaging with no identifying labels.
If you are unsure whether a home test or a forensic or legal test is right for your situation, our DNA experts are available to help.
1.
Collect the DNA Samples
Collect DNA samples using a simple buccal (cheek) swab. Each participant gently swabs the inside of their cheek following the provided instructions.
Samples are then sealed and returned using the prepaid envelope.
2.
Receive Your Results Online
Once samples arrive at the laboratory, testing is completed quickly. Results are delivered securely by email within 2–3 business days and reviewed by experienced DNA analysts.
Rush Next Day Testing is available.
3.
Order Your Home Sibling DNA Test Today
If you are seeking answers about a possible sibling relationship and want a private, convenient testing option, a home sibling DNA test can provide clarity.
Need Help Choosing the Right Test?
If you are unsure whether a home sibling DNA test is right for your situation or need help understanding other relationship testing options, our DNA experts are here to help.
Still not sure which test you need?
Our knowledgeable DNA experts will listen to your unique situation and advise the best testing option for you.
Reach out to our DNA experts for any help with your situation
FAQ About At-Home Sibling DNA Tests
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Choose between a Full Sibling and Half Sibling Test.
A half sibling test only test to see if one parent is in common between the participants. A full sibling test checks to see if the participants have both parents in common -
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.
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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. -
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.
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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.
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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:
Above 90.9%: the sibling relationship is supported by DNA testing
9.09% – 90.9%: inconclusive result, and additional parties need to be tested
Below 9.09%: 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.”
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Yes. When two potential siblings and a mother are DNA tested together, then the probability of an inconclusive result is lower, hence raising the chance that the test will give a conclusive result.
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