easyDNA South Africa - Accredited paternity testing and DNA testing provider.
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Order your DNA Siblings Test. We also perform grandparentage, avuncular and Y chromosome DNA testing.

DNA Relationship Testing

easyDNA South Africe offers a complete portfolio of DNA relationship testing services . Relationship DNA testing can be carried out to scientifically confirm whether two or more individuals are truly biologically related.

easyDNA offers relationship testing for peace of mind or even for court cases. Legal relationship testing results can be presented in court as a proof of biological relationship between alleged relatives. 

The price of a relationship test is of only R3295. This cost may change depending on the type of test, the number of people taking part in the test as well as the DNA samples used. 

Why relationship testing?

Relationship testing is often used as an alternative to paternity testing or even maternity testing (If you are interested in a maternity or paternity tsting, get more information by visiting the relevant pages).

In some cases, children might wish to confirm their biological relationship to a parent (their mother or their father), but are unable to do so due to the parent being unavailable for the test (the parent might often be deceased or not available for the test). 

Types of testing between relatives

easyDNA has a number of different relationship tests available. If you are not sure about which test to choose, have us call you and speak directly to our customer care representatives. Tell us exactly what you want to discover, the sex of the people involved and finally, whether their DNA sample is available for the test. With this information we will guide you to the DNA relationship test most suited to your needs.

Sibling DNA testing                       Order Now

Sibling testing is recommended when siblings want to establish their biological relationship to one common parent. Depending on the type of sibling test, we may require the DNA sample of a known parent. With a sibling test we will biologically confirm whether siblings are uterine siblings (meaning they share a common mother but have different fathers); or agnate siblings (meaning they have the same biological father) but different mothers. Finally, we can also establish full siblingship whereby siblings share both biological parents.

  • Are the test participants males? Do they need to establish whether you have the same father or paternal line? In such instances, easyDNA offers Y chromosome testing. This test is highly accurate and results are ready in 5-7 working days. Visit our page on Y-chromosome testing to get more information.

  • Are test participants females? Do they wish to establish whether they have the same father? Do they have different mothers or the same biological mother? If the the have different mothers, we can opt for an X chromosome test. This type of test can also be done accurately when females have separate mothers but in this case we need to test the mother's DNA sample. Visit our X-chromosome testing page for more information on this test.

  • If both male and female siblings need to take part in the same test, we suggest a full sibling STR test. 
  • Mitchondrial DNA is solely matenally inherited. Analysis of this type of DNA can confirm whether people share the same mother, grandmother or maternal line. Why not breeze our mtDNA testing page for more information about this test?

  • Twins can be either monozygotic or dizygotic. The best way to find out whether twins are identical or fraternal is by doing a twin zygosity test.

Siblingship testing is priced from R3295. Results are available in 5-7 working days receipt of samples at the laboratory. X chromosome testing and MtDNA testing have a longer turnaround time as they require a more complex method of analysis.

DNA testing: grandparentage DNA test            Order Now

Grandparentage testing is a DNA test done between grandparents (grandmother and/or grandfather) alongside their alleged biological grandchildren. A grandparent will share 25% of his or her genetic material with their grandchild.

There are several reasons for doing this test, most commonly grandparents suspect they might not be biologically related to their grandchild and wish to dispel or confirm their suspicions.

In some cases, individuals who might have been given up for adoption might wish to find and confirm their biological relatives by means of a grandparents DNA test.

easyDNA offers duo grandparents testing: in this test we analyse the DNA sample of the grandmother, the grandfather and the grandchild/grandchildren. This test offers the most accurate results.

easyDNA offers grandparents testing with only 1 grandparent but only if the grandchild's mother is available for the test. A single grandparents test is not as accurate and easyDNA does not offer it unless we have the mother's DNA sample.

We offer this test starting from R3295. Your results are ready in 5-7 working days.

Aunt/uncle DNA testing / avuncular DNA test           Order Now

Avuncular DNA testing is a DNA test carried out between an aunt an/or uncle with the DNA sample of their niece or nephew. The DNA test result will express the probability of relationship between the alleged relatives thereby providing a good indication as to whether they are biological relatives or not.

This type of case is often used when the alleged parent of the person is deceased and/or unwilling to participate in testing and a brother or sister of the alleged parent is still alive and available for testing. The sample of the mother is recommended to strengthen the results of the test but is not necessary.

Avuncular testing is priced from R3295. Your results will be sent by email between 5-7 working days from the time of DNA samples are received at the laboratory. 

DNA testing methodologies

STR analysis - Short tandem repeat analysis (or sometimes Microsatellites, also known as Simple Sequence Repeats ) are basically repetitions of certain sequences of DNA. 

In this type of DNA test we use short tandem repeats to determine how much common DNA two individuals have. 

  • Full siblings will share around 50% of their DNA (25% inherited from each parent)
  • Half siblings will share around 25% of their DNA (this is because they only have common DNA from one parent rather than from both)
  • Unrelated individuals can still have common DNA. 

Once we have extracted and analysed the DNA, we proceed to apply complex statistical calculations to decide which sibling relationship is most likely thus establishing whether the people tested are most likely to be full siblings, half siblings or unrelated siblings).

Including the sample of any known parents is a great way to increase the accuracy of your DNA test result. You can include the sample of the mother or the father; this will help us exclude the genetic markers inherited from that parent. 

Your relationship test result will highlight such terms as the probability of relationship and the first order indexes. Why not learn more about Interpreting the result of a DNA Relationship Test ? 

Buccal swabs are the quickest and easiest way to collect your samples. Take a look at our DNA sample collection guide. If you are unable to submit buccal swabs and need to submit other DNA samples such as nail clippings, tooth brushes or other samples, visit our DNA forensic testing page. I fyou intend using any of the samples listed on our forensic testing page, we strongly suggest you consult us for information on collecting and packaging the sample.

Contact us

To discuss further your siblings DNA test or any other relationship test you can contact us or, if you prefer, have us contact you directly.

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