Sibling DNA Testing

Our sibling DNA testing service will determine if individuals are full-siblinghalf-siblings or unrelated. Full-sibling have the same mother and the same father, half siblings only share one parent and unrelated individuals share no parents.


100% accuracy


2 or 4 working day turnaround


ISO 17025 accredited laboratories

Mothers’ Participation

Please note that the results for more complex relationship tests are not usually as conclusive as standard paternity tests. This can result in cases where a relationship may exist but we are unable to detect it, simple due to the way in which the DNA has been inherited. Therefore, we strongly recommend that the mother participates in the DNA test where possible as her participation will allow for a more conclusive result. 

For this reason, your kit will include one swab for one mother which we will process free of charge.


Our laboratory only accepts cheek cell (buccal) samples for sibling DNA tests.

We find that swabbing the inside of the cheek using a soft cotton swab is the most painless, quick and easy method of obtaining a good quality DNA sample.

Our DNA testing kits contain everything you require to for a sibling DNA test.

The kit will include:


This DNA testing service has a 4 working day turnaround.

Once you have placed your order, your sibling DNA testing kit will be dispatched the same day (if ordered before 4pm) by first class post.

Your results will be issued by the 4 working day turnaround time from receipt of your samples at our laboratory. Your results will be sent by email.

Human Tissue Act

Please note, we strongly recommend that the mother of the child participates in the test where possible as this makes the results much more conclusive. For that reason, we will include a swab and will process her DNA free of charge. 

Legal DNA Testing

If you require a DNA test for legal purposes, please follow the link below to dadcheck®

dadcheck® is accredited by the Ministry of Justice as a body that may carry out parentage tests directed by the civil courts of England and Wales under section 20 of the Family Law Reform Act 1969.

dadcheck®gold is reconsigned on the national stage as a leader in paternity and DNA testing and has been providing DNA testing services to the legal profession, mediators, social services and the general public for over a decade.