Grandparentage Tests
Sibling Tests
Avuncular Tests

Complex Relationship DNA Testing

We offer a range of DNA testing kits to determine the presence of biological relationships.

See the links below to our complex relationship DNA tests


Aunt(s) and/or Uncle(s)




Half-Sibling or Full-Sibling

‘Complex’ tests are an option available to those who are unable to test against the alleged father/mother. They are not as straightforward as a paternity test and therefore can result in occasions where a relationship may exist but the laboratory techniques are unable to detect it simply due to the way in which the DNA has been inherited.

How can these tests help?

Avuncular DNA tests are used to establish a relationship between a tested child and their aunt(s) and/or uncle(s).

Grandparentage DNA tests are here to establish a relationship between a tested individual and a possible grandfather or grandmother.

Sibling  DNA tests come in two forms, a half-sibling test (i.e. do two individuals share a common parent or none) or a full-sibling test (i.e. do the tested individuals share two common parents or one).

Mothers’ Participation

Please note, we strongly recommend that the mother(s) of the participants in the test take part where possible, as this helps us obtain the most conclusive result. For this reason we also include a swab for one mother and will process her DNA sample free of charge.


Our laboratory only accepts cheek cell samples, as we find it 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 complex relationship test. The kit will include:

  • Consent form
  • 3 sterile swabs
  • Prepaid return envelope
  • DNA testing information sheet
  • Terms and conditions. 


Choose between a 2-working day or 4-working day turnaround.

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

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

Human Tissue Act

Please be aware that in the UK the Human Tissue Act regulates the collection and analysis of any human tissue. Therefore, in order for your sample to be analysed, each person must give written consent the person of that sample must give their consent in writing.

In order for your samples to be process, all adults giving a cell sample for a DNA test must give their consent for the test by signing the consent form (provided in the DNA test kit). For a child (under 16) we require the consent of a person with Parental Responsibility for the child.

We will not proceed with testing samples until consent from all of the participants in the test has been obtained.

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, providing DNA testing services to the legal profession, mediators, social services and the general public for over a decade.