How many test participants are required?

For grandparents testing, we need samples from the grandmother, grandfather and the grandchild or grandchildren. Grandparents share around 25% of their DNA with each of their grandchildren. Having DNA samples for all 3 individuals will help us achieve more conclusive results. Unless you are carrying out a test between grandfather and grandchild (only males) we do not advise a single grandparents test.

What will my results tell me?

A grandparents test will show how likely it is that the grandmother and grandfather are the biological grandparents of the child. The likelihood is expressed as a probability and the higher the probability the more likely it is that they are the biological grandparents.

How do I use your kit?

The kit we provide includes 4 mouth swabs per person. You will also find instructions on how to use mouth swabs inside the kit but to describe the procedure briefly; each swab needs to be rubbed inside the mouth and under the tongue. Once this is done with each swab, they need to be left to dry. Once dry they can be inserted into the envelopes as explained in the instructions and sent to us for testing.

The grandparentage test for one grandparent and grandchild is priced at $649. You will have your results in 7-10 working days.


As with any order relationship DNA test, adding the sample of the mother is strongly recommended to strengthen the final result. If you want to confirm biological relationships between males, for example between grandfather and grandchild, we recommend a Y-chromosome test. Read more about our relationship DNA tests or proceed with one of the below options.

Granddad and grandson DNA testing

Males from the same blood line have a great advantage over females- this is the fact that males who descend from the same blood line will share the same Y chromosome. Paternal grandfather, father and son will all share the same Y chromosome profile. A Y chromosome test can tell you if grandfather and grandson are related and indirectly confirm whether the grandson’s alleged father is his biological father.

Genetic reconstruction testing

A genetic reconstruction test is used to prove the paternity of a child in instances where the alleged father is not present for testing. In such cases we can use advanced DNA testing methods to determine whether the untested alleged father is the biological father of the child by testing the alleged father’s blood relatives. The test requires the DNA of 4 individuals which can include grandparents. Read more information about our genetic reconstruction test.