Sibling DNA Test


Includes test kit & all lab fees

Our Sibling DNA Test can verify if two people are full or half-siblings.

It’s quick and easy to place your order online.

  • Available for $249.00
  • Secure, confidential results emailed to you in 3 business days
  • Simple mouth swab DNA collection
  • Up to 42 markers analyzed for accurate results
  • Guaranteed results or your money back
  • Over ONE MILLION genetic tests performed since 2004
  • Rated 5 out of 5 stars by ★★★★★

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Due to New York State Department of Health regulations, we cannot offer any peace of mind paternity or relationship tests to New York residents.

Frequently Asked Questions

About our Sibling DNA Test

For $249, including your test kit and all lab fees, our Sibling DNA Test can help individuals determine whether they are full-siblings or half-siblings, with results in just 3 business days.

When both people have the same biological parents, they are classed as full-siblings. Half-siblings are individuals who share only one biological parent, either the mother or father.

When testing for sibling relationships, cheek swabs are used to collect DNA samples from each sibling. For the most conclusive result, we also ask for the biological mother's sample, if available.

The DNA laboratory will then determine the genetic profile of the possible siblings and will calculate a sibling DNA index or likelihood ratio.

A likelihood of greater than 10 indicates that the siblings are related, either full or half, but a likelihood of less than 0.1 does not support this.

A likelihood that falls between 0.1 and 10 is inconclusive, which means that a relationship cannot be determined, based on the data collected and analyzed. The higher the value of the sibling DNA index, the greater the chance that the two individuals tested are full biological siblings.

It is possible to analyze two individuals to determine whether they are more likely to share the same mother and father, share just one common parent, or be totally unrelated.

What will the test cost?

You can order our Sibling DNA Test online now for just $249.

The cost of the test includes your test kit and all lab fees. 

The test includes enough cheek swabs to test two siblings and the biological mother, if available. 

Your test kit will be sent out in discreet, plain packaging, for full confidentiality. 

If you would like to test three siblings, you can select this option for an additional $69 when placing your order. 


What is included in the kit?

For $249, including your test kit and all lab fees, our Sibling DNA Test kit includes:

  • Test request/consent form
  • Complete, easy-to-follow instructions on how to take the test and return your samples to our laboratory
  • A pre-addressed envelope to send your samples back to us
  • Three DNA sample collection swab packages, containing two swabs in each package
  • Individual DNA test sample envelopes for each participant

If you need to test more individuals, you can easily select this option while placing your order.

Once we have received your samples at our laboratory, we will email your password-protected results in 3 business days.

Order your Sibling DNA Test online now for $249. Payment details are 100% secure and will never be sold to third party advertisers.

How do I collect the DNA samples?

Once you have received your kit, simply follow the instructions included to collect your samples.

Rub the swab gently and painlessly on the inside of the cheek to collect cheek cells. Enough swabs are provided to test two siblings and the biological mother, if available for testing.

If you would like to test three siblings, please select this option when placing your order, and additional swabs will be included in your kit (fees apply). 

Is a parent's sample required?

For the most conclusive result, we do ask that the biological mother also provides a cheek swab sample, if possible.

However, this is not essential, and we can still perform a sibling DNA test without the mother’s sample. 

Your test kit will contain enough cheek swabs to collect DNA from two siblings and the biological mother (if available).

When will I receive my kit?

Simply buy your test online now, and we’ll mail it out to you immediately.

Your test kit will be sent directly to your chosen address in discreet, plain packaging, for complete confidentiality. 

You can choose to receive your kit by USPS First Class Mail (included in the cost of your test), or upgrade to USPS Priority Mail (+$9.99) or USPS Priority Mail Express (+$29.99).

When will I receive my results?

Once you have collected your samples, simply mail them back to our laboratory using your preferred shipping method.

As soon as we receive your DNA samples, we begin the testing process at our accredited laboratory.

You will receive your results by password-protected email in 3 business days after we have received your samples.

Our test results are 100% accurate

Our Sibling DNA test results are 100% accurate and reliable based on the samples we receive at our laboratory.

We are also accredited to the international quality standard ISO 17025 for our DNA testing.

In the unlikely event that your test result is inconclusive, we will refund the price of your test, no questions asked. 

This is our money back guarantee.

Can kits be sent to two addresses?

Yes, AlphaBiolabs can mail your Sibling DNA Test kits to two different addresses.

You will find the option to list a 2nd address when you check out.

Both test kits will be sent out in discreet, plain packaging, for full confidentiality. 

What is peace of mind testing?

At AlphaBiolabs, we offer peace of mind testing with all our DNA testing kits.

As the name suggests, a peace of mind DNA test is for personal use only.  

The results of these tests can give you the answers you need, but they cannot be used for legal purposes or in court proceedings.

Peace of mind tests also allow you to collect your samples quickly and easily at home, without the need to use a more costly and time-consuming third-party to verify the DNA sample collection.

Our money-back guarantee

AlphaBiolabs guarantees that we will produce the most accurate results possible from your DNA test samples.

In the rare case that we cannot provide a result with the samples provided, we will either send a new kit and re-test at no cost to you, or offer a 100% no-hassle refund.





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Complete the form below to buy your Sibling DNA Test now

A standard sibling test includes two siblings. If you need to add more siblings please select an option below.

Your DNA results will be emailed to you as standard. If you would also like to receive a hard copy report please select this option below, and a paper copy will be sent to your delivery address.

We also provide options for additional reports. The DNA technical data sheet includes the DNA profiles of each person tested and the likelihood values used to calculate the final results. The electropherogram is the graphical representation of a person’s DNA profile. This includes all persons tested.

Please choose your own password. You will need this password if you speak to one of our advisers.

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