Grandparentage and avuncular testing, confirming family relationships without a parent

When a parent is not available

In some situations the parent needed for a direct paternity or maternity test is deceased, unavailable or unwilling to participate. In these cases it is still possible to establish a biological family connection through extended family testing.

Grandparentage testing

A grandparentage test compares the DNA of a grandparent and grandchild to determine the probability of a biological relationship. It is most commonly used when the alleged father is deceased or absent.

Tips for best results:

• Testing both paternal grandparents produces stronger results than testing just one

• Including the biological mother in the test significantly improves accuracy

Avuncular testing

An avuncular test determines whether a biological relationship exists between an aunt or uncle and a niece or nephew. Like grandparentage testing it is used as an alternative when a direct parent is unavailable.

Common use cases for both tests

• Confirming a child's relationship to a deceased father's family

• Immigration applications requiring proof of extended family relationships

• Inheritance and estate claims

• Reconnecting with biological family members

Accuracy considerations

Both tests produce a probability index rather than a definitive result. The statistical confidence improves significantly with each additional biological relative included in the test. Our team will advise you on the best participants to include for your specific situation.