If you’re trying to determine someone’s biological father (or mother) and the suspected parent is unwilling or unable to be tested, you may be able to test grandparents for a “probability of grandparentage.” Grandparent testing may also be used to confirm a biological family relationship between a child and extended family—if the child is a minor, the legal guardian must give consent. A single grandparentage test can be performed if only one grandparent is available for testing, but the mother must be included in this case.
The way DNA works is you inherit one half of your DNA from your biological mother and the other half from your biological father. Your mother and father also received their DNA in the same way, so their biological parents will carry the same genes that trickled down, and testing them can confirm biological relationships.
All of us carry a quarter of our genes – 25% – from our grandparents. That’s why, although it’s not as strong as a paternity or maternity test, a grandparent test can still look for DNA matches and offer a probability of biological relationships.
You do not have to be local for us to perform your DNA testing. We can arrange collections across the United States. Once all samples have been collected and sent in, results should come within 5-6 days.