Sibling DNA Testing - Find your relation through DNA

Sibling DNA Test

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How much does it cost? 

Our sibling DNA test starts at $199. Additional participants in the testing may cost extra.

How quickly do you get results? 

The results are ready in 2-3 working days from receipt of samples at the laboratory.

Due to New York State Department of Health regulations, we cannot offer any peace of mind paternity or relationship tests to New York residents.  Contact us or click here for more information.

What can our sibling DNA test tell you?

Are you half sibling or full siblings?

If you are half siblings you will share around half of your genetic material and share only one parent. If you are full siblings, then you will share the vast bulk of your genetic material and thus, share both biological parents.

Are you half siblings or unrelated?

If you are unrelated you will have very little, if any, genetic material in common (Although you could have common genetic material by random chance as DNA between all individuals is similar to some degree or other).

We always suggest including the sample of a known mother or parent to provide stronger results.

Sibling DNA testing to replace a parentage test

A siblings DNA test can be used in the place of paternity test.  Through this test we may be able to establish a genetic relationship between siblings and parent without testing the DNA of the parent concerned. If the alleged father is available for the test, we suggest a home paternity test as it will product more detailed results.


How accurate is a siblings DNA test?

Siblings DNA test results can be very accurate at confirming whether siblings share the same mother or the same father. A siblings test is done in cases where direct comparison of parent-child DNA is not possible by means of a Paternity DNA test. It is important to understand that testing parentage without the DNA sample of the actual parent will never be as accurate.

Is a home test court admissible?

Your home test results are not court admissible which means they are entirely for your peace of mind but the result is just as accurate and reliable as a legal test result.  The reasons home paternity test results are not accepted in court is because the sample collection is not performed according to the required chain of custody procedures, and the participants identity is not independently verified.

The siblings being testing are only males. What do you suggest?

Biologically related males have a very strong mark of genetic relatedness that is indisputable – the Y chromosome. All males descending from the same paternity line will share a distinct Y chromosome profile. Thus, we can establish whether two or more males share a common paternal lineage by testing and comparing their Y chromosome. 

The siblings being testing are only females. What do you suggest?

The first DNA test of choice is the Sibling DNA Test.  But there is a test for females who wish to know if they share the same father by carrying out an X chromosome test. If they share the same X chromosome, then they share the same father.

NOTE: in cases where sisters have the same mother, this test can only be done if the mother’s samples are included. If they do not share the same mother, we do not require the sample of the mother.

What are the best testing options for establishing if we have the same mother?

If individuals wish to confirm whether they share the same mother they can opt for two tests:

    • A paternity/maternity test: this test will compare the DNA of mother and child to confirm whether the tested mother is the biological mother.
    • A mitochondrial DNA test: this will compare the DNA of individuals tested to confirm whether they have the same maternal line.