Paternity search

I am looking for a biological father and I am:

Paternity Search is a guide we offer so that you can find the most suitable DNA test for your situation.


Anonymous , free and easy to use, you must answer a set of questions by placing yourself in the position of a person looking for the biological father.


Answers are not recorded and the results of this guide will offer you, depending on the situation, the information on the DNA test you need.

Do not hesitate to contact us, or to contact a laboratory if you have additional questions on theinformation that the guide provides you.  

How to do a paternity search?

Genetic research is a powerful and useful tool when you are in doubt about a parentage link between two people. This gives you the opportunity to use your DNA to prove a biological relationship and thus remove doubt about a family member, confirm your membership from a legal point of view or find unknown relatives.

Unfortunately when you want to do this type of genetic analysis, unlike a genealogy test which will only allow you to have relationship matches by percentage, you must necessarily compare the DNA of two or more individuals. to have a reliable result on your parentage.

So the first thing to do in this situation is to know:


Who is available for DNA testing?

What is the family situation with this person?

Which DNA test to choose?

The search for a paternal filiation link can then be done with close members of the family of the presumed father and depending on the participant  available a choice of DNA test will be offered.

Who can participate in a paternity search?

As indicated  previously  to do a relationship DNA test, you need to compare the DNA of several people to  define a link of paternal filiation. For this we propose in this guide to put you in the position of:  

- A man

- A woman

- A pregnant woman

Depending on your basic profile, you will be able to do genetic analyzes with:  

- The presumed father 

- Your Brothers and Sisters

- Your grandparents

- Your Aunt or Uncle

- A first cousin

Be careful, however, there are conditions for each of the participants and it is often recommended to include your biological mother to improve the results of DNA tests.

What are the conditions for each participant?

The participation of brothers and sisters: 

The genetic analysis can be done between brothers and sisters or with only brothers and conversely only between sisters. In addition, it is not mandatory  than  siblings share the same biological mother for DNA paternity testing.  

Grand parents : 

To do a DNA test between a grandson or a granddaughter and his grandparents is possible provided that both grandparents participate in the test. Genetic labs may offer to do genetic testing with only one grandparent, but we do not recommend this.  choice. Because the lack of genetic information will not bring you a reliable and precise DNA result.

In addition, it is normal to specify that the two grandparents must be the biological parents of the wanted father.  

Take a test with the aunt OR with the uncle:

You must choose the participant between your aunt and your uncle. Using DNA from both is not necessary for good genetic results and the lab may charge you twice for the test. On the other hand, it is very important that the participant chooses, either the brother or the sister  full suit of the alleged father. (They must share the same biological parents)  

The cousin : 

Genetic testing with a first cousin can only be done between males. The DNA comparison will be done by the  bias  of the male sex chromosome which is transmitted only from father to son throughout the paternal line. The condition is that the cousin must be a descendant of your grandfather's male line. (The son of your uncle or any other male descendant exclusively)

What DNA tests are available?

Depending on your family situation and the participants, several DNA tests can be used to answer your doubt of paternity.

The Paternity test : 

To perform a DNA paternity test you must compare your genes to that of a suspected father. This genetic analysis is the most reliable and the most direct to confirm the parentage link between children, boys or girls and the tested father. The biological mother is not obligatory but can also participate in the test.

The Brotherhood test : 

In order to verify a common paternity between brothers and sisters you can choose the fraternity DNA test. The genetic analyzes will offer you a percentage of relation which can vary according to your genes, it is then more interesting to do this test with several participants (more than two) to improve the accuracy of the results. As well as for this test the addition of your biological mother is essential but not obligatory.

The grandparent parentage test :

Gene analysis between grandchildren and grandparents can be done with this DNA test. Since the laboratory does not have the genetic profile of the alleged father, it is important to be able, if possible  add  your biological mother's genetic profile. The test cannot be considered reliable  only with the participation of the two grandparents.

The avuncular filiation test (Aunt & Uncle) :

The genetic test of relationship between a  nephew  and / or a niece can be either with the aunt or with the uncle. We recommend crossing the genera to have more distant genes and therefore a more reliable result: 

- Niece with uncle

- Nephew with aunt

The analysis is always in percentage relation, so it is always recommended to include the genetic profile of your birth mother if possible.

The Y chromosome DNA test : 

The Y chromosome test is as reliable as the paternity test in the results. He will give you either a positive or a negative answer depending on the family situation. Please note that this test can only be done with male individuals to determine if they belong to the same paternal line. Participants can be: 

- Presumed father

- Uncles

- Grandfather

- Brothers

- Cousin

The X chromosome DNA test :

The X chromosome test is a test with very high precision just like the paternity test or the Y chromosome test, it will give you either a positive or a negative answer depending on the family situation and especially depending on the participants. This test can only be done between sisters or with the paternal grandmother and her granddaughter. Depending on the context, it is also important to include the birth mother in order to have results.

The prenatal paternity test : 

For this genetic analysis which is done during pregnancy when the mother is still pregnant, you must imperatively make the genetic comparison with the presumed father. No other member of the family can take the place of the presumed father before the birth of the baby. The mother should provide a blood sample and the father a saliva sample for testing.

Accreditation & reliability of DNA tests

The reliability of a test depends primarily on the accreditation of your laboratory. It is very important that the analysis methods comply with international standards in order to ensure a credible result. But you also have other factors to take into account to improve this reliability: the type of sample, the choice of the test and your declaration are elements that can have an impact on your test.

Which sample can I use?

Choosing the sample is an important step in doing a DNA test . In general, laboratories recommend the use of oral swabs. But depending on the situation it can be difficult and the choice of another type of sample should be considered. But be careful, there are conditions to be respected so that the sample provides enough genetic information for your DNA test .