Relationship DNA Testing between Relatives | EasyDNA South Africa

Sibling DNA Testing

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Sibling DNA 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 different fathers); or agnate siblings (meaning they have the same biological father) but different mothers.

Mitochondrial DNA Test

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MtDNA testing is used to determine whether two or more people share a common maternal lineage. The test is based on the mitochondrial DNA sequence variation that is passed on from females to their offspring. Using this test, we can determine if two or more people are related through their maternal lineage.

Twin DNA Testing

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EasyDNA offers the possibility to carry out an accurate twin DNA test. It is important to bear in mind that basing one’s classification of twins as either fraternal (heterozygotic twins) or identical (monozygotic twins) on appearance is an unreliable and misleading technique.

Grandparentage Test

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Are they your biological grandchildren? Grandparentage DNA testing is a type of relationship test carried out between grandmother, grandfather and grandchild to confirm whether the grandparents tested are the biological grandparents of their grandchild.

Aunt & Uncle Test

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Doubts about your genetic relationship to your relatives? Relationship queries between aunts and/or uncles and nieces and/or nephews could be solved with avuncular DNA testing which determines the probability that people tested are truly the blood relatives.

Y Chromosome Testing

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A Y chromosome test (Y-STR test) is used to determine if selected males SHARE the same paternal lineage. The Y chromosome passed down from father to son and from one generation to the next. This chromosome has a relatively infrequent mutation rate. If a direct male line can be traced then all males in that male lineage will have an identical Y pattern.

X Chromosome Test

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The X-chromosome test by EasyDNA South Africa is most commonly used to determine if sisters with different mothers share the same father. The price of this test is R7895

Genetic Reconstruction Test

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A genetic reconstruction test is designed to establish if a child is biologically related to direct blood relatives on their father’s side of the family. The test is performed when the father in question cannot be directly involved in the test and a direct father-child paternity test cannot be carried out. 

Maternity Test

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A DNA maternity test is used to establish the existence of a biological relationship between an alleged mother and a child. The test works in exactly the same way as the paternity test and the results guarantee minimum probabilities in excess of 99.99%+ for inclusion of maternity, and 100% for exclusion.

What types of relationship test do you offer?
Why relationship testing?
Types of testing between relatives
Maternal lineage testing
Siblings DNA Testing
DNA testing: grandparentage DNA test
Aunt/uncle DNA testing
DNA testing methodologies

What types of relationship test do you offer?

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 testing, 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.

Maternal lineage testing

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?

Siblings DNA Testing

Siblingship testing is priced from R3295. Our siblings tests include Y chromosome testing, X chromosome testing and sibling testing. Results are available in 5-7 working days receipt of samples at the laboratory (X chromosome test results take longer). Read more about our sibling DNA testing.

DNA testing: grandparentage DNA test

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 R3995. Your results are ready in 5-7 working days.

Aunt/uncle DNA testing

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. If you 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.