A paternity test can compare the alleged father and child without a sample from the mother. Both participants usually provide cheek swabs.
The mother's sample can help in some complex cases. Below, learn when it matters, how results are interpreted, and which collection option fits your family.
Key Takeaways
- Standard participants: one alleged father and one child; the mother's sample is optional.
- Collection: painless cheek swabs at home, with split kits available for separate addresses.
- Complex cases: tell the laboratory if possible fathers are brothers or close relatives.
- Official use: arrange legal testing before collection if results are needed in court.
How Does a Paternity Test Work with Just the Father and Child?
A child inherits DNA from both biological parents. A paternity test compares specific DNA locations, called markers, in the child and alleged father.
What the laboratory compares
At each marker, the child has two alleles: one inherited from each parent. In a father-and-child comparison, the lab checks whether the child's alleles are consistent with inheritance from the tested man.
How the result is calculated
- Consistent matches: the laboratory calculates a Combined Paternity Index (CPI) and reports a probability of paternity, typically 99.99% or higher.
- Mismatches at multiple markers: an exclusion is reported with 0% probability of paternity.
The statistical model is designed for a two-person comparison. It does not require the mother's sample to evaluate whether the tested man could have contributed the child's paternal alleles.
My Forever DNA uses 24 genetic markers through its AABB-accredited, CAP-certified U.S.-based laboratory partner, providing more comparison points than a 16-marker test.
Is a Father-and-Child Paternity Test Accurate Without the Mother?
Accredited laboratories can provide conclusive results from a father-and-child comparison. The report distinguishes two outcomes:
When the result supports paternity
An inclusion typically reports a 99.99% or higher probability of paternity. The CPI compares the evidence for the tested man with that for a random, unrelated man; it can reach into the hundreds of millions.
When the result excludes paternity
Mismatches across multiple markers can definitively rule out the tested man. An exclusion is reported as 0% probability.
Why some matches carry more statistical weight
Common allele values occur more frequently in the population, so an individual match carries less weight. Testing 24 markers supplies more comparison points. In some cases, adding the mother's sample can increase the CPI.
When Would Including the Mother's DNA Help?
The mother's sample is optional in a standard case, but it can help the laboratory in three situations.
Possible fathers are related
Brothers share approximately half their DNA. Identifying the alleles inherited from the mother can help the lab evaluate the child's paternal contribution more precisely.
Tell the lab before testing if possible fathers are brothers or other close relatives, whether or not the mother participates.
A marker needs clarification
Occasionally, an allele pattern can be interpreted in more than one way. The mother's DNA provides another reference point.
The pair shares common allele values
Identifying the maternal contribution can clarify which allele came from the father and strengthen the statistical result.
For most cases involving one alleged father, one child and no known relative complications, the mother does not need to participate.
What's Included in a Father-and-Child DNA Test Kit?
A standard My Forever DNA kit contains:
- Cheek swabs for the alleged father and child
- Labeled collection envelopes for each participant
- A Result Notification Form
- Prepaid return shipping
- Collection, labeling and storage instructions
Swabbing is painless and takes less than a minute per person. No blood draw, clinic visit or appointment is needed for home collection.
Results: typically 1–3 business days after all samples reach the laboratory. Your DNA Specialist confirms processing and delivers the results securely by email.
What If the Father and Child Live in Different Locations?
A multiple location DNA test kit lets participants collect separately instead of sharing a single-address kit.
- A separate kit is shipped to each address.
- Each participant collects and mails their own sample.
- The laboratory processes the case when both samples arrive.
The collection addresses do not change the DNA analysis. Multi-location kits include prepaid shipping for both participants and the same 24-marker analysis through the accredited laboratory.
See the full guide to paternity testing when the father and child live in different states.
Can a Father-and-Child DNA Test Be Used in Court?
Home collection: personal knowledge
A self-collected at-home test does not include verified identity and witnessed collection. It is intended for private answers, not court use.
Legal collection: documented chain of custody
For custody, child support, immigration or another legal proceeding, arrange a legal test from the start. The father and child can still be tested without the mother, but collection must be supervised and documented.
If official use may be needed, review My Forever DNA's legal testing options before ordering.
What If the Father Is Unavailable or Unwilling to Test?
If the alleged father cannot or will not provide a sample, alternative testing options may still confirm a biological relationship with the child:
- Grandparent DNA testing compares the child's DNA to the alleged father's parents. This works best when both grandparents participate, but single-grandparent testing is also possible. See grandparent DNA test kits.
- Sibling DNA testing compares the child's DNA to a known child of the alleged father to determine whether they share one or both parents. See sibling DNA test kits.
- Aunt/uncle (avuncular) DNA testing compares the child's DNA to the alleged father's sibling. See aunt/uncle DNA test kits.
- Discreet DNA testing uses personal items belonging to the alleged father (toothbrush, hair with root, nail clippings, earwax) instead of a cheek swab. Success depends on sample quality, and these tests are for informational purposes only. See discreet DNA testing options.
Each of these alternatives serves a different situation. If you're unsure which approach fits your case, contact our team at 402-800-7161 or sales@myforeverdna.com for guidance.
FAQ: Father-and-Child DNA Testing
Does a paternity test require the mother's consent?
The mother's DNA sample and legal permission to test a child are separate questions.
For a minor, authorization rules vary by state, especially if the alleged father is not the legal guardian. Customers must follow applicable local and state requirements.
Can a newborn be tested?
Yes. Cheek swab collection is safe for newborns and infants. The swab collects cells from inside the cheek and is completely non-invasive.
How many children can be tested with one kit?
A standard paternity kit tests one alleged father and one child. If you need to test multiple children with the same father, kits are available for 2 children, 3 children, and 4 children.
Is there a free paternity test for father and child?
There is no scientifically valid free DNA paternity test available from accredited laboratories. Some companies advertise free collection kits but charge lab processing fees separately. At My Forever DNA, all lab fees and shipping are included in the kit price - there are no hidden charges or separate lab fees after purchase.
What if I'm not sure a standard paternity test is the right option?
If your situation involves a potentially related second father, a deceased or absent alleged father, or a need for court-admissible results, our team can help you choose the right test before you order. Call 402-800-7161 or email sales@myforeverdna.com.
