Order Sibling DNA Testing Kit NowDNA Siblingship Test

Peace of Mind DNA Siblingship Test Kit
Legal DNA Test Kit

The GTL DNA Siblingship Test determines the statistical probability of whether or not siblings (brothers and sisters) share the same two parents. The price of the DNA test is at £249 which includes two siblings but you may add more if required at extra cost.

When seeking to determine siblingship and establish whether applicants are true biological siblings, the most conclusive method is to test their parents. If the alleged parents are unavailable or unwilling to provide DNA samples, a sibling DNA test can be carried out to analyse the relationship of biological siblings. Including a common parent greatly increases the accuracy of this type of DNA test and is recommended if at all possible. If this is not possible, disclosing that siblings share a common mother or father can also lead to more meaningful results.

Sibling DNA testing is different to a paternity test which will always provide conclusive results. When processing a siblingship test, our DNA laboratory will establish the genetic profile of each of the alleged siblings. Depending on the genetic material inherited by each alleged sibling, a siblingship DNA index is calculated. If the siblingship DNA index is less than 1.00 it indicates that the alleged siblings are not related. If the siblingship DNA index is greater than 1.00 it indicates that the tested applicants are more likely to be true biological siblings. The higher the siblingship DNA index value, the greater the likelihood that the tested applicants are true biological siblings.

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IMPORTANT NOTE: When testing male siblings to determine whether or not they share a common father, a Y-STR Male Lineage DNA Test may provide a more conclusive result. If siblings are trying to determine whether or not they share the same maternal lineage, an X-SV DNA Test may provide a more conclusive result. Please email us or call one of our Customer Service Advisors on 0333 300 3130 for more information.

In order to determine the likelihood that the alleged siblings share one parent in common rather than two (mother and father), a half siblingship DNA index is calculated. By comparing the half siblingship DNA index against the full siblingship DNA index we are able to determine whether the alleged siblings are more likely to have one parent in common (e.g. the mother only) or two parents in common (mother and father).

GTL sibling DNA tests are performed using a method known as “All-vs-All”. This means that when a sibling DNA test is carried out between two siblings, for example Ann and Bob, one report will be issued detailing the relationship between Ann and Bob. When testing three siblings, for example Ann, Bob and Charlie, three reports are generated detailing the relationships between Ann & Bob, Ann & Charlie and Bob & Charlie. Testing four siblings would result in six reports: Ann & Bob, Ann & Charlie, Ann & Dave, Bob & Charlie, Bob & Dave and Charlie & Dave.

If you have any questions regarding the additional costs of testing more than two siblings please email us or call one of our Customer Service Advisors on 0333 300 3130.

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Peace of Mind Sibling DNA Testing Kit

Order your home sibling DNA test kit and collect samples following a few easy steps. Our siblingship DNA test cost is of £249 and includes DNA testing of two applicants. See the information box below for full details. Additional children or a known parent may be tested at an extra cost of £70 each.

We can only guarantee standard result turnaround time when testing takes place solely using oral swab samples. Using a discreet sample for your test may lead to an increase in turnaround time.

Legal Siblingship Testing Kit

Order your legal sibling DNA test kit or CSA DNA test if you need court admissible results. Our laboratory processing cost for legal sibling DNA testing is £349 and includes DNA testing of two applicants. Additional children or a known parent may be tested at an extra cost of £119 each.

To qualify as an accredited legal DNA test, the DNA sample collection process must be witnessed by a health professional or neutral third party with no interest in the outcome of the test. The identity of the applicants submitting DNA samples must also be verified by photographic proof of identity and 2 passport-sized photographs of each applicant must accompany the samples.

NOTE: The health professional may charge a sampling fee and this cost is not included within our fees.

*Why so cheap? Click here to find out more about our cheap DNA tests

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Our DNA Siblingship Test Includes:

  • Discreet packaging marked ‘Private & Confidential’

  • DNA testing of two alleged siblings

  • Confidential DNA test results in 5-7 working days
  • Our legal ISO accredited DNA tests are available and include free Special Delivery postage of the sampling kit to your chosen health professional

Simple. Accurate. Affordable. Guaranteed. Call us on 0333 300 3130 Now

Order securely online or call our Customer Service team on 0333 300 3130
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Step 1

Step 1: Choose Your DNA Test

Informational DNA Test
A 2-person peace of mind siblingship test. The cost of the service includes two alleged siblings. You may add more as needed, for example a third sibling or known parent.

Order Paternity Test Kit Now


Legal DNA Test
If you would like your DNA test results to be admissible in a court of law, you will need the Legal DNA Test. Click here to learn more about the differences between informational DNA tests and legal DNA testing.

Order Paternity Test Kit Now

Step 2

Step 2: Check Shipping Information

Please take a minute to read the important information below:

All home DNA testing kits are sent in plain, discrete packaging marked ‘Private & Confidential’. There is no return address, no company name and nothing to show what is inside.

For home DNA test kit orders within the United Kingdom:

You will be asked to select how you would like your DNA testing kit sent to you.

Royal Mail 1st class should take 1 working day to reach you but is not guaranteed and may take longer. 

Recorded Delivery 1st class should take 1 working day to reach you and requires a signature on delivery. We will be able to provide a tracking number if required. Please note that Recorded Delivery is not guaranteed and may take longer to reach you.

Special Delivery is guaranteed for delivery before 1pm the following working day but is not guaranteed for delivery on a Saturday. We will be able to provide a tracking number if required.

If you would like your order sent by a courier service, please email us or call one of our Customer Service Advisors for a quote on 0333 300 3130.

For home DNA kit orders outside the United Kingdom:

You will be asked to select how you would like your DNA testing kit sent to you.

Royal Mail Airmail should take three days to Western Europe, four days to Eastern Europe and five days for the rest of the world.

Airsure mail receives priority handling in the UK and abroad, making it faster than the normal Airmail times. However, it is not a guaranteed courier service.

If you would like your order sent by Federal Express or another courier service, please email us or call one of our Customer Service Advisors for a quote on 0333 300 3130.

When home DNA test kits are shipped:

All orders received by 4pm GMT Monday to Friday will be dispatched the same day. GTL do not dispatch or receive DNA kits at weekends or on public holidays.

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Step 4

Step 3: Complete Guide to DNA Testing


Check our complete guide to DNA testing, paternity test and genetic testing services, fees and refund policy.

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Step 5

Step 4: Additional DNA Testing and Sampling
Information

Information about how DNA samples are collected, the differences between legal DNA testing and informational (peace of mind) DNA tests, buccal mouth swab samples versus "pin-prick" blood sample collection and more is available here.

Find out more about what is required with legal paternity testing, court ordered DNA tests, CSA DNA test and immigration DNA testing.

We understand that finding the answer is very important. Discover the benefits of our paternity test and DNA testing.

Release of DNA Test Results

DNA test results will be available to download from this website 5-7 working days after we receive the DNA samples, completed form and payment of the laboratory processing fee. Click here to see sample DNA Paternity Test results reports.

Peace of mind DNA results are also available by telephone, email or post for an additional administration fee, currently £5 for telephone, £10 for email and £15 for first class post.

Other Sources of DNA

Should you find you are unable to provide a mouth swab sample, or do not wish to concern or upset your child by collecting a DNA sample in this way, we are able to extract DNA from a variety of other sources at additional cost. These alternate sources include hair, nail clippings, chewing gum, cigarette butts and clothing. Please click here for full details of other DNA sources we can work with, prices and success rates.

Please do not hesitate to call one of our Customer Service Advisors on 0333 300 3130 or email us for more information.

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Interested in our other DNA Testing and Paternity Test Services?

Review a complete guide to our services, fees and refund policies.

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DNA Siblingship Test

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Discover your GeoGenetic Roots with Ancestral Origins Ancestry testing

Consent is required from each person being tested before a sample can be taken. In the case if minors, individuals suffering from a mental disorder or those who are not in a position to give their own consent, a legal guardian or a person having parental responsibility for the individual must consent. Under the Human Tissue Act it is a criminal offense to take a sample from someone to test their DNA without their consent, except for medical purposes and lawful investigative purposes, for example a criminal investigation. Click here to view Department of Health Human Tissue Act 2004 information.
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