Guide to Grandparentage DNA Tests

Published on 20 Dec

Grandparentage DNA testing is a method used to establish if two or more individuals share a paternal grandmother/grandfather and grandchild relationship. It involves the analysis of DNA samples from potential grandparents and a child, with the expectation of finding common maternal or paternal genetic markers that confirm their relation.

Situations Necessitating Grandparentage DNA Testing

Grandparentage DNA tests have proven invaluable in various circumstances, with the common denominator being when an alleged father is unable to participate in a paternity test. There are several reasons why these instances may occur:

Unavailability of the Alleged Father

This situation might arise due to several reasons. The alleged father might be geographically distant, making it impractical or impossible for him to provide a sample for a paternity test. He could be actively evasive, refusing any contact or communication, or he might be imprisoned with no viable option to submit a DNA sample. In these cases, the grandparents’ DNA can be tested in his stead.

Death of the Alleged Father

There can be situations where, unfortunately, the father passes away before a DNA paternity test can be carried out. If a preserved DNA sample is not available, a grandparentage test is an alternative solution, capable of providing critical information about the alleged father’s genetic contribution to the child’s DNA.

Refusal of Participation by the Alleged Father

In cases where paternity is disputed, the alleged father might refuse to participate in a paternity test for personal or legal reasons. A grandparentage test, with the willingness of the grandparents to participate, can help in establishing sufficient evidence of the paternal relationship to the child.

Legal Implications

Legal matters such as inheritance disputes, immigration cases, or custody battles can also necessitate grandparentage DNA tests. If there’s a need to establish a biological relationship with the alleged father for these legal proceedings, and the father himself is not available, a grandparentage DNA test provides an alternative solution.

In all these situations, if the alleged father’s biological parents are available, they can provide the necessary DNA samples to complete a grandparentage test, thus confirming whether or not there exists a biological grandparent-grandchild relationship.

Analysis Process of Grandparentage DNA Testing

The analysis process of grandparentage DNA testing focuses on comparing the DNA profiles of potential grandparents with that of the child. It aims to identify shared paternal genetic markers that indicate a biological relationship.

DNA Inheritance

Our genetic material, specifically DNA, constitutes the building blocks for our unique physical attributes and traits. We inherit half of our DNA from each of our biological parents. If a grandparent and grandchild share a biological relationship, scientific methods can identify common genetic markers that confirm the kinship.

DNA Markers

In the analysis process of grandparentage DNA testing, certain specific regions of the chromosome are examined. These regions, known as genetic markers, exhibit predictable inheritance patterns. By comparing the markers between the child and the potential grandparents, it’s possible to identify those that have been passed down through generations.

Inclusion of Biological Mother

Though it is not mandatory to have the biological mother participate in the grandparentage test, her inclusion greatly improves the interpretation of results. When the mother is involved, the child’s genetic profile can be compared to hers, effectively filtering out maternal DNA markers. This enables more precise comparisons between the child and the potential paternal grandparents.

Analyzing the Results

The results of a grandparentage DNA test are usually presented as a probability of relatedness. This figure, expressed as a percentage, reflects the likelihood of a genetic relationship between the child and the potential grandparents. A higher probability (typically above 90%) implies a greater chance of a biological relationship, whereas a lower probability suggests no biological connection. Laboratories such as ours, use a variety of statistical models to calculate this probability, taking into consideration the genetic information of the tested individuals.

Through the careful examination of DNA markers and the application of statistical models, grandparentage DNA testing can provide valuable information regarding genetic relationships between potential grandparents and a child. By including the known biological mother in the process, the results are better refined, ensuring a clearer understanding of the tested individuals’ connections.

Types of Grandparentage DNA Tests Offered by

At, we provide two types of grandparentage DNA tests to accommodate varying family situations and help answer questions about biological relationships. These tests can offer valuable insights but are not suitable for legal purposes, such as UK courts or the Child Maintenance Service.

Test Option 1: Child and One Grandparent

The first test option involves analyzing the DNA samples of a child and one grandparent. This test can be useful in situations where only one grandparent is available for testing. The mother of the child is encouraged to participate at no extra cost. The turnaround time for this type of test is four days, and the cost is £145.

Test Option 2: Child and Two Grandparents

The second test option involves analysing the DNA samples of the child, their known biological mother, and two alleged grandparents. The mother of the child is encouraged to participate at no extra cost. The inclusion of the mother’s sample enables a more accurate interpretation of the results. This test option has a turnaround time of four days and comes at a cost of £215.

Important Note: Limitations of At-Home Grandparentage DNA Tests

Please keep in mind that the at-home grandparentage DNA tests offered by are designed for personal information use only. These tests are meant to provide insight into potential biological relationships and should not be used for legal purposes. The results of these tests won’t be accepted as legal evidence in UK courts, the Child Maintenance Service, or any other legal body.

Always ensure that you order the appropriate test for your needs. If you have any questions or need assistance in choosing a test, feel free to reach out to our dedicated customer support team for guidance.

Step-by-Step Guide to Grandparentage DNA Testing

Follow this straightforward guide to conducting a grandparentage DNA test with effectively.

Step 1: Understanding the Test

Firstly, understand the significance and applications of a grandparentage DNA test. It’s used to confirm whether a grandparent-grandchild relationship exists. This test handles situations where the alleged father is unavailable, deceased, or unwilling to participate in a paternity test.

Step 2: Ordering the Test

Visit and select the type of grandparentage DNA test you would like to order: Child + 1 grandparent or Child + mother + 2 grandparents. Add the selected item to your cart and proceed to checkout. Fill in your personal information and complete the payment.

Step 3: Sample Collection

We can send testing kits to separate addresses should the participants live far away from each other. Once your test kits arrive, follow the included instructions to properly collect your DNA sample. It’s recommended that biological mothers participate in the sampling process for better interpretation of the results. All necessary tools for sample collection are provided in the kit.

Step 4: Pack and Send the Samples

After collecting the samples, securely pack them as instructed. Send the package back to our testing laboratory in our tamper-proof pre-paid envelope.

Step 5: Waiting for Results

Once all samples are received, we shall update the ordering party by e-mail with the expected results due date (generally around 4 working days). During this period, the DNA samples of the tested individuals are analysed for common genetic markers that indicate a grandparent-grandchild relationship.

Step 6: Receiving the Results

Upon the completion of testing, you will receive the test results. The exact method of delivery will be outlined by the service; often this is via email, a secure online portal, or post.

Note: While these results are indicative of the presence or absence of a biological relationship, they might not always be conclusive, especially if one of the biological parents is not available for the test. The results are strictly for personal information and will not be accepted as legal evidence in UK courts or by the Child Maintenance Service.

Step 7: Interpreting the Results

Look at the results. A result in favour of a relationship between grandparent and grandchild will show a high probability of relatedness, while a result with low or no support for a relationship will show a low percentage of probability. If you have any queries concerning the result, or would like help interpreting the report,, you can contact our customer service for further assistance.

Always remember, a paternity test offers the most definitive proof of a biological relationship. You should consider this option if it’s feasible to obtain a sample from the alleged father.

About us is a UK-based service that offers a variety of DNA tests, categorised broadly into personal information tests and legal tests. Our personal information tests include paternity DNA tests, sibling DNA tests, twin DNA tests, grandparentage DNA tests, and avuncular (aunt or uncle) DNA tests.

Our legal tests category offers DNA tests for different legal reasons, including surrogacy, immigration, and other legal purposes. We provide support for individuals on how to take a DNA sample and offer FAQs and beneficial videos on the subject.

Our legal service assures the processing of DNA tests in leading, accredited UK laboratories that are recognised by the Ministry of Justice. Delivery times and prices vary depending on the type of test and the number of people tested. We also offer next-day services for added convenience.

Every ordered and processed DNA test, along with its samples, results, and relevant information, is securely managed and sent to the consumers, keeping privacy paramount. For immigration purposes or for full parentage reports, we offer specially accredited services. We are here to provide technologically proficient, accredited, and confidential service for all DNA testing needs.

Share this: