Sibling DNA Testing – Choose the Best Option for You


Both options give you everything required to collect cheek-swab samples quickly and safely at home. Select the approach that fits your situation.

Person using a smartphone showing a ‘Buy Now Pay Later’ screen, representing low-cost payment options for home paternity DNA testing.

Option 1. Request a Free Sibling DNA Test Kit — Pay the Lab Fee When You Return Samples

► Postage is the only cost today

► Laboratory fee is paid once you post your samples back

► Or choose split payments: part on return, part on completion

► No analysis fee upfront

► Quick processing once samples are received, typically next working day results

Get a Free Sibling Test Kit
Home sibling DNA test kit components laid out, including swabs, envelopes and paperwork.

Option 2. Pay Upfront

► Free sibling DNA test kit included

► Free postage

► Option to spread the lab fee over instalments (subject to eligibility)

► No further costs once your samples are returned

► Fast results - next working day

Order Sibling DNA Test Kit
ISO 17025 accredited UK lab technician handling DNA test samples for paternity testing.

Simple, Reliable Sibling DNA Testing — Two Flexible Payment Options

Both sibling DNA test options use the same ISO 17025–accredited laboratory process and deliver the same accurate, reliable results. The only difference is when you choose to pay, allowing you to select the option that best suits your circumstances without compromising on quality, accuracy, or turnaround time.

Each kit includes everything needed to collect cheek-swab DNA samples quickly, comfortably, and discreetly at home, with clear step-by-step instructions provided.

Sibling DNA testing can help determine whether individuals share both parents, one parent, or are not biologically related.

All samples are analysed in our UKAS ISO 17025–accredited UK laboratory, with results typically issued the next working day* once all samples have been received and are ready for analysis.

Important

This test is intended for personal information and peace-of-mind purposes only. For legally recognised sibling DNA testing (for example, for court or immigration purposes), please contact our team on 0800 988 7107 for advice on the correct testing route.

*Next working day results apply from the date your samples are received at the laboratory. Returned samples are checked to ensure everything is complete and ready for analysis. If we spot anything that could delay your results, we’ll get in touch quickly to help resolve it.

Why families choose DNA Clinics for sibling DNA testing

✔ Free or low-cost ordering options
Choose a free sibling test kit (pay only for postage if applicable), or order a full-pay kit with free postage,

✔ Flexible payment choices
If you prefer, you can split the lab fee — paying part when samples arrive at the lab and the remaining balance when results are ready.

✔ Fast Accredited laboratory testing
Sibling comparisons are analysed in an ISO 17025-accredited laboratory for dependable accuracy. Results are typically provided on the next wroking day from receipt of samples at the lab.

✔ Friendly support from real Clinical Advisors
Our team is here to guide you, answer questions, and help you understand the sibling testing process.

✔ Option to switch to a clinic appointment
If you later decide you require a legal sibling test, we can book you into one of our nationwide DNA Clinics.

Sibling DNA Testing – Frequently Asked Questions

1. How accurate is a sibling DNA test?

Sibling DNA tests are highly reliable when assessing whether individuals share one or both biological parents. The laboratory analyses multiple genetic markers (loci) and compares results between participants to determine the statistical likelihood of a full sibling, half sibling, or unrelated relationship.

While sibling tests cannot provide the same level of certainty as a paternity or maternity test, they can still deliver very strong, laboratory-verified evidence when both participants provide clear cheek-swab samples.

All testing is carried out by an ISO 17025–accredited UK laboratory, ensuring the highest standards of accuracy.

2. What relationships can a sibling DNA test determine?

A sibling test can help confirm whether individuals are:

  • Full siblings (same biological mother and father)
  • Half siblings (one biological parent in common)
  • Unrelated (no biological parent in common)

Where possible, including the biological mother can improve the strength of the comparison, but the test can still be performed without her involvement unless stated otherwise.

3. How long do sibling DNA test results take?

Results are typically issued on the next working day once all samples have been received at the laboratory. Samples must pass quality and documentation checks before analysis begins.

If anything requires clarification — for example, incomplete forms or unclear swabs — our team will contact you promptly to avoid unnecessary delays.

4. Can I pay later or split the lab test fee?

Yes. You can:

  • Order a free sibling test kit and pay the laboratory fee only when you return your samples, or
  • Pay the full fee upfront with free postage

Eligible customers may also be able to spread the cost using PayPal Pay Later, Klarna, or other split-payment methods shown at checkout.

These flexible options are designed to make sibling testing accessible regardless of your budget.

5. Does everyone need to be present to take part in a sibling DNA test?

No — each participant can collect their cheek-swab sample separately and at their own convenience.

If siblings live at different addresses, simply request extra swabs when ordering or contact us if you need to arrange additional kits.

Each participant must follow the instructions carefully to ensure proper sample collection and avoid delays during laboratory processing.

6. Can this sibling test be used for court, immigration, or legal reasons?

No. Home DNA test kits are intended for personal information only and cannot be used as legal evidence.

If you require a legally recognised sibling test for court, child arrangements, passport/visa applications, or any official matter, please contact us on 0800 988 7107.

We can arrange an appointment at one of our nationwide DNA Clinics where samples are collected under strict chain-of-custody procedures.

7. Will anyone else know I’ve taken a sibling DNA test?

Your test is completely confidential.

We do not share your data or results with any third parties, and results are sent securely by email to the person who ordered the test.

All personal information is handled in line with UK GDPR and our strict privacy policy.

If you would like results issued to more than one individual, our team can help set this up.

8. What happens after I send the samples back?

Once all samples reach the laboratory:

  1. They undergo a quality and documentation check
  2. DNA is extracted and analysed
  3. A statistical comparison is performed
  4. A secure report is issued to you by email within the expected timeline

If the lab identifies an issue — such as insufficient DNA or unclear handwriting — we will contact you straight away to resolve it.