A grandparent DNA test confirms a biological grandparent-grandchild relationship. When the alleged father is unavailable, deceased, in another state or country, or chooses not to participate, his parents (one or both) can be tested in his place to establish biological lineage. We process every sample through an AABB-accredited lab, with an optional legal version for court use.
When the alleged father can't be tested directly but his parents can, a grandparent test is often the closest possible substitute. The shared DNA between a child and his or her grandparents is significant, which is why this option tends to be highly conclusive.
If the alleged father has passed away but his parents are still living, a grandparent test is often the most direct way to confirm or rule out biological paternity.
He may be in another state or country, no longer in the family's life, or unreachable. If his parents can be tested, you can still get an answer.
If the alleged father will not consent to testing but his parents are willing, grandparent testing provides a strong path forward.
When proof of biological lineage is required for a probate or inheritance case and the father is gone, a legal grandparent test is widely accepted.
Survivor benefits and other government claims often require court-admissible proof of biological relationship. A legal grandparent test satisfies that requirement.
To add or remove a father's name from a birth certificate when he is unavailable, a legal grandparent test can establish biological lineage for the state.
The lab analyzes shared DNA markers between a child and one or both of the alleged father's parents. Roughly 25% of a child's DNA comes from each grandparent, which gives the lab substantial genetic material to compare.
A simple cheek swab from each participant. Painless, quick, and collected by an AABB Certified Technician at a location of your choosing.
You can test one grandparent or both. Including both biological grandparents on the father's side delivers a significantly stronger and more conclusive result.
Including the child's known biological mother further strengthens the result by letting the lab subtract her contribution and isolate the paternal side more precisely.
An AABB-accredited lab analyzes the shared genetic markers using STR (Short Tandem Repeat) analysis, the same method used in paternity testing.
The result is reported as a probability. A high probability (typically 99% or above) supports a biological grandparent-grandchild relationship; a low probability indicates no biological relationship.
Delivered securely via email. Hardcopy mailed results available for $25. Legal results carry a notarized stamp for court use.
Grandparent testing is probability-based: the lab calculates how likely the shared DNA pattern is given a biological grandparent-grandchild relationship. Around 99.8% accuracy is achievable, and conclusiveness scales with how much paternal-side DNA the lab can examine.
Results are strongest when:
If only one grandparent is available, the test is still valuable and still highly accurate, but the result is reported as a probability rather than a definitive match. We will tell you exactly what to expect for your specific setup before you decide to schedule your appointment.
Mobile collection, certified specialists, AABB-accredited lab processing, and clear results.
Call or text us 7 days a week, 9 AM – 9 PM. A real person (not a robot) will walk through your specific situation and recommend the strongest test setup for your family.