Grandparent DNA tests or Grandparent Relationship testing, allows the parent or parents of the alleged father to participate in DNA testing in order to prove paternity. In rare cases, grandparent testing may be used to determine if the grandparent is the maternal grandparent to the child. A Grandparent DNA test result will provide a statistical likelihood that the grandparent/grandchild relationship exists.
Grandparent testing can include one or both of the grandparents, but including both grandparents offers a stronger result. Also including the biological mother is always suggested in relationship testing. Adding the biological mother helps prevent inconclusive results. If the biological mother is not available, the test can still be performed.