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Siblings DNA Test
Do you share one biological parent, or both biological parents? Or perhaps none? EasyDNA offers siblings DNA testing services to help brothers and sisters discover whether they share both biological parents, a single parent or have no parents in common.
Free Delivery
Results in 5-7 working days
from $299
- Discover whether you're full or half siblings
- Easy-to-use Home Kit
- Get answers in 5-7 working days
- Support at every step of the process
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How it Works
How it Works
94% Customer Recommendation Rate
Key Features of the Siblings DNA Test
About sibling testing
Due to the nature of the New York State Department of Health’s regulations, we cannot offer peace-of-mind paternity or relationship tests to New York residents. However, we can offer legal paternity and relationship tests in New York. Contact us or click here for more information.
A siblings DNA test is the best option when two or more individuals want to verify whether they share a common parent. Sibling testing is only carried out in cases when the people taking part in the test are brothers and sisters – in other words, both male and female test participants are involved in the same test.
Typically, brothers and sisters who carry out this test want to know whether they share the same biological father. However, a sibling test will never provide a result that is as accurate as a paternity test. The cost of a sibling test is $299.
We strongly suggest including the sample of a known mother to provide stronger results.
Your siblings DNA test results
Siblingship test results are based on statistical calculations which provide, what is called, a siblingship index. It is difficult to predict how accurate a test result will be as it very much depends on how much common genetic material the individuals share and whether or not they have included the sample of the mother. Brothers and sisters share around half (50%) of their DNA.
Test results are intended to provide a statistical likelihood that gives evidence to support the tested relationship in question. Providing additional parties to be tested (for example, a known parent’s sample) or performing direct relationship testing may provide additional evidence.
In the case of all relationship testing, we recommended that a known parent (normally the Mother) is included in the test to strengthen the result.
PLEASE NOTE: In the event of a possible, pre-existing relationship, the laboratory would NOT be able to run a sibling test if you believe your cousin could be your sibling. Please contact us to help you find the right test for you.
Siblings DNA Testing: Collecting samples
Samples can be collected with EasyDNA’s own sample collection kit which is sent to you once we have confirmed your order. Compact, discrete and easy-to-use, our sample collection kit enables you to collect the DNA samples we need in just a few easy steps. Kits contain swabs per person, consent forms and instructions. Learn more about the sample collection procedure HERE.
Note: We can only guarantee standard result turnaround time when siblings DNA testing takes place solely using oral swab samples. Using a discreet sample for your test may lead to an increase in turnaround time.
If test participants are males
This test determines male lineage. Rather than a regular siblings DNA test, a Y chromosome test can be carried out when only males are involved and they wish to discover whether they have the same birth father or different birth fathers. Visit our Y chromosome testing page for more information on this test.
An MtDNA test can be carried out if participants wish to determine maternal lineage. Visit our mtDNA testing page for more details on this type of test.
Common Cases for DNA Sibling Testing
The most common use for this test is to determine the likelihood that individuals share the same parents in common. In situations where one or both parents are unavailable, or unwilling to be tested, the best option is to analyse the DNA between siblings and make direct comparisons.
There are various reasons for brothers and sisters to resort to siblings DNA testing in order to prove a biological relationship. In some cases, individuals have been separated from a young age, and find their alleged brother or sister later in life, often after parents are deceased. Sometimes a sibling will have doubts as to who their real father is. They might feel sure they share the same mother but have concerns over their biological father. A sibling test clarifies whether siblings are fully or on half related, possibly eliminating any doubts over paternity. During inheritance disputes or claims, siblings may need to prove their biological relationship.
Before embarking on a siblings DNA test, it is important to identify who is available for testing as this will assist the DNA laboratory to decide which test is most applicable to your case. There can also be various stages of testing with additional people included in the test if the first results do not yield a satisfactory result. When minors are involved, permission from their legal guardians or parents may be required.
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The Human Tissue Act
It is important to be aware that in the UK the Human Tissue Act regulates the collection and analysis of any human tissue. In order to send a sample for analysis, the person or donor of that sample must give their consent in writing in order for us to test their sample. Furthermore, in order to be fully compliant with the Human Tissue Act, the donor of the sample must also be made aware of how their DNA sample will be used. Failure to comply with the Human Tissue Act is a criminal offence.
We will not proceed with any testing if we do not have consent from all test participants. Testing any samples will be put on hold until we get the required signatures from all individuals.
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