Although it does not happen often, it may happen that two brothers have shared intimacy with the same woman. If that woman becomes pregnant, it is necessary to perform an at home paternity test to find out which of the two is the father. Even though they share the same DNA, the laboratory in charge of processing the samples can find out who the father is with 99.9% accuracy. However, keep in mind that the laboratory needs to know this reality once you send the DNA paternity test kit samples. If the lab does not know that the possible fathers are siblings, it could assume that the samples were taken incorrectly and void the test. Although the samples are taken by you, it is important that you tell the laboratory everything about your case so that the scientists know how to analyze the DNA correctly.
How are the samples taken?
Since there are two possible fathers, each man has to take a separate test. That is, each man must purchase a test. Each kit comes with a set of swabs that should be rubbed on the inside of the cheeks of each potential father and the potential child. They should be rubbed 7 to 10 times in a circular motion. The swabs should be placed immediately into the containers provided in the kit. These containers should be sealed to avoid contamination of the samples during transport. It is important to fill in all the information requested by the laboratory to avoid confusion when they start to analyze the DNA. Do not forget to mention that you are sending two tests because you are analyzing samples from two siblings. If you have any doubts, contact the laboratory before purchasing any tests.
What to do if someone refuses?
There may be a situation where one sibling refuses to take the DNA test. In this case, laboratories offer several alternatives. One of them is to use the DNA of the sibling who wants to take the test. The laboratory is able to discover whether the man who did not submit to the test is the father of the child. Another alternative is to use the DNA of a male family member such as the father, an uncle, a cousin, etc. Whatever the case is, it is important to inform the laboratory. Typically, laboratories analyze 16 to 20 DNA markers. In these particular cases, laboratories need to test more DNA markers to obtain reliable results.