Grandparent DNA Testing — Paternity When the Father Is Unavailable

Grandparents seek DNA testing on their grandchildren for two common reasons: they have doubts about the paternity of their son's or daughter's child, or they would like to prove they are related to a grandchild whose family denies the relationship and bars them from developing a bond with the child.

A grandparentage DNA test is one of the most reliable alternatives to a direct paternity test. It compares the DNA of the child with that of the alleged paternal grandparents to determine the probability of a biological relationship. Grandparents share 18–32% of their DNA with their grandchild, with an average of about 25%.

Including the mother's sample significantly helps in obtaining more decisive results, closer to 99.9%.

Grandparent DNA test results are usually available within 2 to 2 to 5 business days after the collection of DNA from all concerned parties. Results may be used as proof for Social Security benefits, inheritance and insurance claims, and some immigration cases.

We are a trusted grandparent DNA testing provider in California, serving Oakland, San Francisco, Los Angeles, Sacramento, San Diego, Fresno, Riverside, Stockton, Vallejo, and all major cities — as well as clients nationwide in all 50 states. If parties are in different locations, we coordinate testing at partner laboratory sites throughout the U.S.

Grandparent DNA Testing FAQs