Grandparents Day 2026: When a Grandparent DNA Test can provide answers

Grandparents Day (September 13) is a chance for families across the country to celebrate the role grandparents play in their lives.

For most of us, that role is built on love, memories, and time spent together. But for some families, the connection between a grandparent and grandchild carries a more practical significance, particularly when a child’s biological father or mother isn’t around, or isn’t willing, to confirm parentage.

In this blog, we’ll explain the genetic relationship between grandparents and grandchildren, when a grandparent DNA test can provide answers, and how AlphaBiolabs’ accredited testing options work.

What is grandparent DNA testing?

Grandparent DNA testing is used to determine whether a child is biologically related to a potential grandparent.

Every child inherits 50% of their DNA from their biological mother and 50% from their biological father. That DNA is passed down again to the next generation, which means a grandchild typically shares around 25% of their DNA with each of their grandparents.

Because the relationship is once removed, the test works a little differently than a straightforward paternity or maternity test. Instead of a direct genetic match, our expert geneticists make a biostatistical calculation, known as the likelihood ratio for relatedness, to determine whether the tested individuals are biologically related.

There are three possible outcomes for a grandparent DNA test:

• A score of 10 or above is supportive, meaning there is very strong evidence that a relationship does exist
• A score of 0 to 0.1 is not supportive of a relationship
• A score between 0.11 and 9.9 is considered inconclusive, meaning it isn’t possible to determine whether a biological relationship exists

Learn more: Complex DNA relationship testing

When is a grandparent DNA test the right option?

A grandparent DNA test is often used when the potential parent of a child is unable to provide a DNA sample for a standard paternity or maternity test. If a biological father or mother has passed away, can’t be located, or refuses to take part, testing a paternal or maternal grandparent can help verify the child’s parentage. 

This can be especially important in situations like:

• Informal kinship care arrangements. According to the Annie E. Casey Foundation, nearly 2.5 million children in the US are currently being raised in kinship care. Where a grandparent steps in to care for a grandchild outside the formal foster care system – temporarily or long-term – DNA testing can confirm a biological relationship, providing definitive answers before pursuing formal, permanent legal guardianship.
• Family disputes or uncertainty following a bereavement. Where questions arise about a child’s family connections after a parent has died.
• Blended or extended family situations. Such as a child having a step-grandparent they assumed was a biological relative, or a family wanting clarity on how a grandparent fits into the family tree.

A grandparent DNA test can also be useful in other scenarios, including:

• Confirming a family connection that has surfaced through adoption records or genealogy research.
• A grandparent seeking their own peace of mind about a biological connection to a grandchild.

It’s important to note that an AlphaBiolabs Grandparent DNA Test can give you answers for your own peace of mind/personal knowledge, but the results cannot be used in court or for other official matters such as applications for state-funded kinship care support or custody proceedings.

If you need a legally recognized result, you’ll need to instruct for a legal DNA test, which involves formally verified sample collection and identification.

Learn more: How to choose the right DNA test – a comprehensive guide

How does a grandparent DNA test work?

At AlphaBiolabs, grandparent DNA testing is a simple, non-invasive process. All that’s required is a cheek swab DNA sample from the child and the grandparent.

These samples are then analyzed at our ISO 17025 and BBB A+ accredited laboratory to identify matching DNA markers and calculate the likelihood ratio.

Our process:

• Sample collection: Collect the DNA samples yourself at home, with our easy-to-use cheek swabs. No clinic visit required.
• Choice of test: Our standard test analyzes 25 DNA markers, already ahead of the industry standard of 16-21. For customers who want the most powerful result available, our enhanced test analyzes up to 45 markers, strengthening the statistical result and increasing the chance of a conclusive outcome.
• Laboratory analysis: Our expert geneticists compare the DNA profiles of everyone tested to calculate the likelihood ratio and determine the probability of a biological relationship.
• Turnaround: Results are available in just 3 business days from when your samples reach our laboratory.

Learn more: DNA testing FAQs

How much does a grandparent DNA test cost?

An AlphaBiolabs Grandparent DNA Test starts from just $149, including your test kit and all lab fees.

The cost of the test includes testing for one potential grandparent and one potential grandchild. You also have the option to test more potential grandparents and grandchildren, or upgrade to our enhanced 45-marker test.

Why choose AlphaBiolabs for grandparent DNA testing?

When you’re exploring a family relationship, especially one where a parent isn’t available for paternity testing or maternity testing, you need answers you can trust, from a lab that takes your privacy seriously.

At AlphaBiolabs, we specialize in informational grandparent DNA testing, providing accurate, private results to help you better understand your biological connections.

• Versatile testing: Determine paternity or maternity when a parent is unavailable or unwilling to be tested, confirm a biological relationship for an informal kinship care arrangement, or get personal clarity on a family connection
• Exceptional accuracy: Up to 45 DNA markers analyzed, for a robust result
• Rigorous quality control: Our ISO 17025 and BBB A+ accredited lab uses advanced technology and strict quality checks to maintain the highest level of precision and reliability
• Fast turnaround times: Results available in just 3 business days from lab receipt of samples
• Trusted experience: Over 20 years helping families find answers through at-home DNA testing
• 100% private and confidential: We’ll NEVER share your DNA results or data with any third-party organizations or DNA matching services

Order your Grandparent DNA Test online today or contact our friendly team on 727-325-2902 / info@alphabiolabsusa.com for more information.