Free Home-Kit Sibling DNA Test

Free Home-Kit Sibling DNA Test

This test uses the latest DNA technology to establish whether individuals are full siblings (sharing both a biological mother and biological father), half siblings (sharing only one biological parent), or whether the individuals are biologically unrelated. 

Why use a Sibling DNA test?

The Sibling DNA test is usually used as an indirect way of proving the paternity (biological father) of a child and conclusive results are achieved in over 96% of test cases*.

If the paternity (biological father) of a child/individual is in question but the potential father is not available to participate in a DNA test, then a DNA sample from an undisputed child of the potential father can be used to establish a biological connection in his absence.

The Sibling DNA test can be used to answer questions such as:

  • Do we have the same father?
  • Are we full siblings or half siblings?
  • Are we half siblings or unrelated?
  • We have the same mother, but do we have the same father?

 

The Sibling DNA test should only be used if it is not possible to obtain a DNA sample from the potential father. If the potential father is available for a DNA test, then a Paternity DNA test should always be carried out. Paternity DNA tests are available from DNA Clinics and can be purchased on boots.com

What are the types of Sibling DNA test and who should participate?

There are typically two forms of Sibling DNA Test:

Full Sibling Analysis

This test is carried out when test participants have one known biological parent in common and want to test whether they also share a second biological parent. In most cases, the participants have the same biological mother and want to test whether they have the same biological father.

The DNA test kit contains three sets of mouth swabs. DNA samples should be taken (using the mouth swabs) from the two potential full siblings, and the third set of mouth swabs should be taken from their biological mother if possible. Including a DNA sample from the biological mother may increase the probability of obtaining a conclusive and highly accurate DNA test result.

Half Sibling Analysis:

This test is designed to establish whether the test participants are half siblings (sharing one biological parent) or whether the individuals are biologically unrelated. In most cases, the test participants know that they have different biological mothers but want to test whether they share the same biological father. The DNA test kit contains three sets of mouth swabs. DNA samples should be taken (using the mouth swabs) from the two potential half siblings, along with mouth swabs from at least one of the sibling’s biological mothers if possible.

If the biological mothers of both potential half siblings wish to participate in the test, a further set of swabs can be obtained from DNA clinics by calling 0800 988 7107. This will be subject to an administration fee of £30.

There is also a third form of Sibling DNA test which is much more uncommon than those mentioned above:

Full Sibling Vs Unrelated

This form of Sibling DNA test is rare and is used to establish whether the participants share both biological parents or whether they are unrelated. In most cases, this test is used when participants were adopted or otherwise separated from their siblings at an early age.

Why is the biological mother’s DNA sample so important?

In relationship DNA testing, the mother’s sample is extremely useful to scientists comparing the DNA profiles of test participants. This enables the elimination of half of the ‘known’ test participants genetic profile and focus the comparison on the remaining DNA in question.

Therefore, if available, we strongly recommend the inclusion of DNA samples from the biological mother(s) when submitting your DNA test kit.

It is important to provide a DNA sample from at least one biological mother to include in the above sibling tests. Failure to provide this will decrease the probability of obtaining conclusive DNA results. If such samples are not available, advice should be sought by calling 0800 988 7107 and speaking to one of our trained Clinical Advisors. Depending on the situation, a different form of test (for example a Grandparent DNA test) may be recommended. Grandparent DNA tests are available from DNA clinics.

How does the Sibling DNA test work?

DNA samples taken from the mouth swabs provided, are used to generate a DNA profile for each test participant. The DNA profiles are compared and statistically analysed in order to determine the likelihood of the tested relationship i.e. the likelihood that the participants are biologically related as full siblings, half siblings or that they are biologically unrelated.

The Sibling DNA test is based on the fact that a child inherits half of his or her DNA profile from each of their biological parents i.e. half the child’s DNA profile matches their biological mother and the other half matches the biological father.

Due to this, the DNA molecule of full siblings and half siblings will demonstrate an increased amount of genetic material in common, when compared to the DNA of unrelated individuals.

The Sibling DNA test not only provides evidence of whether two individuals are related or not, but can provide evidence to what degree those individuals are related i.e. whether the individuals share one biological parent or two biological parents.

How are the results interpreted for the Sibling DNA Test?

In order to determine the most likely relationship between the individuals tested, complex statistical analysis is carried out while comparing the DNA profiles of each test participant. This statistical analysis takes into consideration many different factors. These factors include the number of matches between the DNA profiles of each test participant and how popular those particular DNA markers are within a given population and ethnic group.

The values from the calculations are used to generate a percentage probability value. This value will indicate which relationship is most likely to exist between the test participants. For example, if two individuals want to know if they are full or half siblings, the percentage probability will indicate which relationship is most likely to exist.

When should other forms of DNA test be used?

Sibling DNA tests and Grandparent DNA tests are usually used to establish the identity of the biological father, without directly including that alleged father in the test.

Although Sibling DNA tests and Grandparent DNA tests can be very accurate, they cannot replace the tests that directly analyse and compare the DNA of a potential biological parent.

Sibling DNA tests and Grandparent DNA tests are not as conclusive as Paternity tests and should only be used when the alleged father of a child is not available for testing.

If a Paternity DNA test cannot be performed, but the potential grandparents of a child are available, then a Duo Grandparent DNA test would be recommended. This is because the DNA of the paternal grandparents can be used to reconstruct the DNA profile of the absent son i.e. the alleged father. Grandparent DNA tests are available from DNA clinics.

If the paternal grandparents are unavailable and the alleged father has another undisputed child, then a sibling DNA test can be performed. If there is any uncertainty about the type of DNA test that should be used, please call Clinical Advisors on 0800 988 7107 to discuss your options.

Inconclusive Results

DNA tests are highly accurate. Conclusive DNA results are achieved in over 96% of Sibling DNA test cases.*

However, as with any DNA test of this type, there is a small chance that the statistical analysis will yield an inconclusive result.

Inconclusive results are not the same as negative results. An inconclusive result means that the laboratory analysis cannot provide an answer to the question posed by the client.

Inconclusive results occurs in less than 4% of Sibling DNA tests.*

Causes of inconclusive results in DNA tests include:

  • All the DNA markers that show matches between test participants are very common within the relevant general population. In these circumstances the matches do not provide the required statistical evidence to confirm whether or not a biological relationship exists.
  • There is a lower level of DNA matches than expected, between the DNA profiles of the test participants due to the chance nature of inheritance in families.
  • Where matches may have originally occurred, mutation has changed the DNA marker and caused mismatches at further locations within the DNA profile.

    *Conclusive results are obtained in over 96% of Full Sibling DNA tests when the biological mother is included in the test.

    We believe that DNA testing should be accessible to all, providing the answers you need to important questions about family relationships.


    Remember, if you have any questions about which DNA test is right for you, you can speak to one of our fully trained Clinical Advisors and get the expert advice you need.

    £0.00

    This test uses the latest DNA technology to establish whether individuals are full siblings (sharing both a biological mother and biological father), half siblings (sharing only one biological parent), or whether the individuals are biologically unrelated. 

    Why use a Sibling DNA test?

    The Sibling DNA test is usually used as an indirect way of proving the paternity (biological father) of a child and conclusive results are achieved in over 96% of test cases*.

    If the paternity (biological father) of a child/individual is in question but the potential father is not available to participate in a DNA test, then a DNA sample from an undisputed child of the potential father can be used to establish a biological connection in his absence.

    The Sibling DNA test can be used to answer questions such as:

    • Do we have the same father?
    • Are we full siblings or half siblings?
    • Are we half siblings or unrelated?
    • We have the same mother, but do we have the same father?

     

    The Sibling DNA test should only be used if it is not possible to obtain a DNA sample from the potential father. If the potential father is available for a DNA test, then a Paternity DNA test should always be carried out. Paternity DNA tests are available from DNA Clinics and can be purchased on boots.com

    What are the types of Sibling DNA test and who should participate?

    There are typically two forms of Sibling DNA Test:

    Full Sibling Analysis

    This test is carried out when test participants have one known biological parent in common and want to test whether they also share a second biological parent. In most cases, the participants have the same biological mother and want to test whether they have the same biological father.

    The DNA test kit contains three sets of mouth swabs. DNA samples should be taken (using the mouth swabs) from the two potential full siblings, and the third set of mouth swabs should be taken from their biological mother if possible. Including a DNA sample from the biological mother may increase the probability of obtaining a conclusive and highly accurate DNA test result.

    Half Sibling Analysis:

    This test is designed to establish whether the test participants are half siblings (sharing one biological parent) or whether the individuals are biologically unrelated. In most cases, the test participants know that they have different biological mothers but want to test whether they share the same biological father. The DNA test kit contains three sets of mouth swabs. DNA samples should be taken (using the mouth swabs) from the two potential half siblings, along with mouth swabs from at least one of the sibling’s biological mothers if possible.

    If the biological mothers of both potential half siblings wish to participate in the test, a further set of swabs can be obtained from DNA clinics by calling 0800 988 7107. This will be subject to an administration fee of £30.

    There is also a third form of Sibling DNA test which is much more uncommon than those mentioned above:

    Full Sibling Vs Unrelated

    This form of Sibling DNA test is rare and is used to establish whether the participants share both biological parents or whether they are unrelated. In most cases, this test is used when participants were adopted or otherwise separated from their siblings at an early age.

    Why is the biological mother’s DNA sample so important?

    In relationship DNA testing, the mother’s sample is extremely useful to scientists comparing the DNA profiles of test participants. This enables the elimination of half of the ‘known’ test participants genetic profile and focus the comparison on the remaining DNA in question.

    Therefore, if available, we strongly recommend the inclusion of DNA samples from the biological mother(s) when submitting your DNA test kit.

    It is important to provide a DNA sample from at least one biological mother to include in the above sibling tests. Failure to provide this will decrease the probability of obtaining conclusive DNA results. If such samples are not available, advice should be sought by calling 0800 988 7107 and speaking to one of our trained Clinical Advisors. Depending on the situation, a different form of test (for example a Grandparent DNA test) may be recommended. Grandparent DNA tests are available from DNA clinics.

    How does the Sibling DNA test work?

    DNA samples taken from the mouth swabs provided, are used to generate a DNA profile for each test participant. The DNA profiles are compared and statistically analysed in order to determine the likelihood of the tested relationship i.e. the likelihood that the participants are biologically related as full siblings, half siblings or that they are biologically unrelated.

    The Sibling DNA test is based on the fact that a child inherits half of his or her DNA profile from each of their biological parents i.e. half the child’s DNA profile matches their biological mother and the other half matches the biological father.

    Due to this, the DNA molecule of full siblings and half siblings will demonstrate an increased amount of genetic material in common, when compared to the DNA of unrelated individuals.

    The Sibling DNA test not only provides evidence of whether two individuals are related or not, but can provide evidence to what degree those individuals are related i.e. whether the individuals share one biological parent or two biological parents.

    How are the results interpreted for the Sibling DNA Test?

    In order to determine the most likely relationship between the individuals tested, complex statistical analysis is carried out while comparing the DNA profiles of each test participant. This statistical analysis takes into consideration many different factors. These factors include the number of matches between the DNA profiles of each test participant and how popular those particular DNA markers are within a given population and ethnic group.

    The values from the calculations are used to generate a percentage probability value. This value will indicate which relationship is most likely to exist between the test participants. For example, if two individuals want to know if they are full or half siblings, the percentage probability will indicate which relationship is most likely to exist.

    When should other forms of DNA test be used?

    Sibling DNA tests and Grandparent DNA tests are usually used to establish the identity of the biological father, without directly including that alleged father in the test.

    Although Sibling DNA tests and Grandparent DNA tests can be very accurate, they cannot replace the tests that directly analyse and compare the DNA of a potential biological parent.

    Sibling DNA tests and Grandparent DNA tests are not as conclusive as Paternity tests and should only be used when the alleged father of a child is not available for testing.

    If a Paternity DNA test cannot be performed, but the potential grandparents of a child are available, then a Duo Grandparent DNA test would be recommended. This is because the DNA of the paternal grandparents can be used to reconstruct the DNA profile of the absent son i.e. the alleged father. Grandparent DNA tests are available from DNA clinics.

    If the paternal grandparents are unavailable and the alleged father has another undisputed child, then a sibling DNA test can be performed. If there is any uncertainty about the type of DNA test that should be used, please call Clinical Advisors on 0800 988 7107 to discuss your options.

    Inconclusive Results

    DNA tests are highly accurate. Conclusive DNA results are achieved in over 96% of Sibling DNA test cases.*

    However, as with any DNA test of this type, there is a small chance that the statistical analysis will yield an inconclusive result.

    Inconclusive results are not the same as negative results. An inconclusive result means that the laboratory analysis cannot provide an answer to the question posed by the client.

    Inconclusive results occurs in less than 4% of Sibling DNA tests.*

    Causes of inconclusive results in DNA tests include:

    • All the DNA markers that show matches between test participants are very common within the relevant general population. In these circumstances the matches do not provide the required statistical evidence to confirm whether or not a biological relationship exists.
    • There is a lower level of DNA matches than expected, between the DNA profiles of the test participants due to the chance nature of inheritance in families.
    • Where matches may have originally occurred, mutation has changed the DNA marker and caused mismatches at further locations within the DNA profile.

      *Conclusive results are obtained in over 96% of Full Sibling DNA tests when the biological mother is included in the test.

      We believe that DNA testing should be accessible to all, providing the answers you need to important questions about family relationships.


      Remember, if you have any questions about which DNA test is right for you, you can speak to one of our fully trained Clinical Advisors and get the expert advice you need.