How to perform a DNA paternity test when the prospective fathers are related?

Although the title of this article may sound like an episode of a soap opera, sometimes it happens that a woman has been intimate with two men who are usually brothers or cousins. In this case, a DNA paternity test can clarify who the father is with 99.9% accuracy. However, for this test to be carried out successfully, the laboratory needs to know this information. This is because, as they are relatives, more DNA markers need to be analyzed. If a DNA paternity test is performed and the laboratory is not informed of this, the result could be inconclusive and lead to more doubts. It is important that you always communicate with the laboratory and inform them of all the details to avoid mishaps or misunderstandings.

Precautions when testing at home

Thanks to advances in technology today you can perform one of these tests at home. You just buy the kit on the Internet and receive it in the comfort of your home. To take the samples, you will use swabs that come with the DNA paternity test. These swabs must be rubbed on the inside of the cheeks of the persons to be tested. Since we are talking about two fathers and one son, then you should test each of them. One test with the samples of one father and the possible child, and the other DNA paternity test with the samples of the other father and the possible child. In this way the laboratory will receive both samples and you will be able to conclude who is the biological father. Remember that these results have no legal effect.

What happens if one of the men does not want to perform the DNA paternity test?

Sometimes it is likely that one of the possible fathers does not want to undergo this test. It is important to emphasize that you should never take DNA samples without the consent of the person. In the case that only one possible father wants to take the DNA paternity test, all you have to do is inform the laboratory that there is another possible father who is a direct relative. Usually, laboratories test 16 DNA markers (the best laboratories check 20 DNA markers) which can create what is known as a “false positive”. For a DNA paternity test to be reliable, the laboratory must have all the information. This way, they can decide whether to perform additional tests in case the results are inconclusive.

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