Does Adding the Mother to a Paternity Test Also Confirm Maternity?
Not automatically. In My Forever DNA's standard paternity test, a known biological mother's sample is an optional reference for the father-child analysis. It does not include an independent maternity determination or a separate maternity report. If you want both parent-child relationships evaluated, choose a test that specifically includes both paternity and maternity.
The distinction is easy to miss because both arrangements can involve the same three people: a man, a woman and a child. What changes is the question the laboratory is asked to answer and the conclusions included in the reports. This guide explains those options for postnatal cheek-swab testing, so you can order the analysis that matches your family's question.
What are the three ways to set up the test?
A standard paternity case can be completed with the alleged father and child, or with a known biological mother included as a reference. A combined paternity and maternity case separately evaluates both parent-child relationships.
Father and child only
Participants and sample roles
Alleged father and child
Question evaluated
Is this man the child's biological father?
Included report scope
A paternity conclusion for that father-child comparison.
Paternity with a maternal reference
Participants and sample roles
Alleged father, child and known biological mother as an optional reference
Question evaluated
Is this man the child's biological father, using the mother's DNA to assist the analysis?
Included report scope
A paternity conclusion. A separate maternity determination and report are not included.
Combined paternity and maternity
Participants and sample roles
Alleged father, alleged mother and child, with both parent-child relationships evaluated
Question evaluated
Is this man the biological father, and is this woman the biological mother?
Included report scope
One paternity report and one maternity report.
The key difference is the analysis requested:
- The first two configurations use the standard at-home paternity test. The third uses the combined paternity and maternity kit.
- In the reference arrangement, the woman's biological relationship is supplied as known case information. In the combined arrangement, her relationship to the child is itself a question to be evaluated. That distinction matters more than counting how many people provide swabs.
How does a mother's reference sample help a paternity test?
At the autosomal DNA markers used in relationship testing, a child inherits one version, called an allele, from each biological parent. The National Human Genome Research Institute's allele definition explains this inheritance pattern.
What the mother's reference sample changes:
- Comparing the child's DNA with the known mother's DNA can help identify the maternal contribution and clarify which genetic information must be evaluated against the alleged father's sample. The mother's sample therefore adds information to the paternity analysis. It is useful for a reason; it is not simply an extra name on the paperwork.
- The laboratory can also analyze a father-child pair without the mother's sample. AABB's parentage calculation training distinguishes these two-person comparisons from three-person paternity comparisons. Both are established testing configurations.
- Including a maternal reference does not guarantee that every complicated case will become straightforward. Tell the team if possible fathers are close biological relatives or if any relationship being supplied as known is uncertain. The laboratory needs the correct family information when deciding how to evaluate the case.
When do you need a maternity test or a combined test?
If the question is whether a particular woman is the child's biological mother, request a maternity determination. Do not describe that relationship as known simply because she is available to provide a reference sample.
Choose the test according to the relationship you need answered:
Only the father-child relationship is uncertain
Choose paternity testing. A known mother's sample can be added as a reference when available.
Only the mother-child relationship is uncertain
Choose a maternity DNA test, which directly compares the alleged mother and child.
You need both relationships evaluated and reported
Choose the combined paternity and maternity kit, or contact the team to confirm the appropriate arrangement for your participants.
A couple of practical notes:
- For example, if an adult child wants to evaluate two people believed to be their biological parents, both relationships should be identified as questions before testing. Calling one adult a known parent would not accurately describe that case.
- If you are still comparing the two types of testing more broadly, our paternity versus maternity guide explains their different purposes. The key ordering question here is whether the woman's sample is assisting a paternity analysis or whether her own relationship to the child also needs a conclusion.
Ordering example: the same three people, different reports
Paternity with maternal reference
A family has one child and two adults willing to provide cheek swabs. They initially want to establish whether the man is the child's biological father, and the mother's biological relationship is known. The standard paternity kit is currently $139. Her optional reference sample can be included without an additional charge, and the case provides a paternity result.
Combined paternity and maternity
Before ordering, the family decides they also want a separate determination of the woman's biological relationship to the child. The appropriate choice is now the combined paternity and maternity kit, currently $219 for one alleged father, one alleged mother and one child, with two independent reports.
All three people may provide samples in either arrangement. The difference is the analysis and reporting they have requested. The free maternal-reference option does not purchase that second relationship determination. See the DNA test cost guide for current prices and package inclusions.
How can you tell whether your report includes a maternity result?
Read the relationship named in the report's conclusion. A paternity conclusion addresses the alleged father's relationship to the child. A maternity conclusion addresses the alleged mother's relationship to the child.
If a mother's name or DNA profile appears in a paternity report, that alone does not mean a separate maternity determination was ordered or reported. Likewise, a high probability of paternity is a statistic about the father-child comparison, not a second probability for the mother-child relationship.
When reviewing the paperwork, check three things:
When interpreting the paperwork:
- The ISFG recommendations on paternity statistics emphasize the importance of the hypotheses, assumptions and reporting details underlying a calculation. For a customer, the practical implication is to read the stated relationship conclusion rather than infer another result from the list of samples.
- With My Forever DNA's combined kit, you receive a separate paternity report and maternity report. Those conclusions can differ, so read each for the relationship it addresses. If you expected a maternity result but received only a paternity report, ask your Dedicated DNA Specialist to check the case scope. Do not try to calculate an additional relationship result from individual marker matches yourself.
What should you confirm before collecting samples?
Describe the result you need in plain language. For example: "I want a paternity result, and the known mother can provide a reference sample," or "I need separate answers for both parent-child relationships." This helps the team select the appropriate test and paperwork.
Also confirm the following:
- Who is participating: identify each adult's role and which child is being tested. If there are several children or different mothers, explain which relationships are known and which need evaluation.
- Where collection will happen: explain if participants need materials at different addresses. Do not assume the combined kit's standard shipping arrangement covers additional locations.
- What the results are for: if a court or agency needs the result, confirm its requirements and arrange legal testing before collection. Self-collected home kits are intended for personal knowledge.
- Who will receive the reports: list the authorized recipients on the completed Result Notification Form. Providing a reference sample does not replace completing the result-recipient instructions.
Final collection and delivery reminders:
- Only submit samples you are legally authorized to provide. Use the collection materials assigned to each participant and follow the kit's labeling, drying and return instructions.
- For the combined kit, standard U.S. orders include prepaid FedEx shipping both ways. Results are typically ready within 1 to 3 business days after all required samples and completed forms are received and accepted for processing. Shipping is additional, and laboratory business days exclude weekends and holidays. Both PDF reports are emailed together only to the authorized recipients listed on the completed Result Notification Form.
Frequently asked questions about maternal reference samples
Can a father-and-child test be accurate without the mother's sample?
Yes. My Forever DNA's standard paternity test can compare the alleged father and child directly. The product describes results typically showing 99.999% or higher probability when paternity is confirmed and 100% exclusion when excluded. Read our father-and-child-only guide for that setup, and disclose any relevant family complications before ordering.
Does an optional mother's sample mean her consent is never needed?
No. Whether the laboratory needs a person's DNA sample and who has legal authority to authorize testing are separate questions. Confirm the required authorization for the participants in your case, especially when a minor or custody arrangement is involved. Only submit samples you are legally authorized to provide.
Does adding the father's reference sample to a maternity test also confirm paternity?
Not automatically. The same distinction applies in reverse: a known father's reference sample can assist a maternity analysis without adding a separate paternity result. Choose the combined kit when you need both parent-child relationships evaluated and reported.
Can the mother provide a reference sample from a different address?
Contact the team before ordering to arrange the participants, collection materials and shipping locations. Explain whether her sample is a reference for paternity or whether maternity also needs evaluation. Adding a participant and adding a shipping address are separate changes to the case.
Can I add a maternity result after a paternity test is finished?
Ask your specialist to review the original case before placing another order or sending more samples. A completed paternity report does not automatically include a maternity result. The team must confirm whether additional analysis, authorization, fees or a new collection would be needed; do not assume an earlier sample can be reused.
Is the mother's blood sample in prenatal paternity testing also optional?
No. Non-invasive prenatal paternity testing uses a different process involving the pregnant woman's blood sample and the alleged father's sample. The optional maternal cheek-swab reference described here applies to standard postnatal paternity testing. See the prenatal paternity service for that separate process.
Choose the test by the answers you need
Use standard paternity testing for a father-child answer, maternity testing for a mother-child answer, and the combined kit for both. If you are unsure how to describe the participants or which conclusions your order includes, contact My Forever DNA before collecting. Tell the team which relationships need to be evaluated so the case is set up to answer those questions.
Sources and service information
- National Human Genome Research Institute: Allele, for the inheritance explanation.
- AABB: Relationship Testing Statistical Calculation Training, Module 1, for the distinction between parentage duo and paternity trio calculations.
- Gjertson and colleagues, International Society for Forensic Genetics: Recommendations on biostatistics in paternity testing, for the importance of the evaluated hypotheses, assumptions and report documentation.
- My Forever DNA: the linked standard paternity, maternity and combined-kit pages, for sample roles, included reports, current prices and service arrangements.
