Your Journey of Identity

Do We Have The Same Father?

The question we hear the most often is “Can a DNA test determine if siblings have the same father?” The answer is yes.

Most of the time a sibling DNA test is done for the specific reason to determine paternity. Paternity testing determines whether or not the two, or more, individuals have the same biological father.

Only companies whose sibling testing provides the same answer on test results was done for private reasons or legal reasons, should be used to ensure the results are accurate .

Our sibling test is guaranteed to be 100% accurate for both home and legal DNA testing.

What Are Some Circumstances When An Absent Father Test Is Done?

Maybe times the possible father has died, or he may be incarcerated, or is unwilling or otherwise unavailable to take a paternity test. These are the situations that sibling DNA testing was designed for.

A DNA Test Between Siblings Can Be Private

A sibling test is usually done to put a person’s mind at ease, as the question about who the biological father is does not really go away until it is answered. Peace-of-mind results can provide the information needed to help move forward once the truth is known.

DNA Testing Can Be Done Discreetly

In a non-legal sibling test, you can also test items other than a mouth swab, if the possible sibling is not available to provide their DNA by mouth swab. You can learn more about this type of testing by clicking on Alternative DNA Samples.

Many people choose to do a DNA test in secret not wanting to say anything about the results until they have the answer to their questions.

However, there are also times that a sibling test needs to be done to determine if a biological father is the same between two or more people for legal reasons.

The results from a legal sibling DNA test can be used to establish a paternal relationship o a child to obtain Social Security survivor benefits for their child. In this type of case, the biological father of one child is undisputed, and the mother needs to prove that the other child has the same father. Sibling DNA tests are also frequently performed to provide evidence of biological relationship for U.S. immigration applications.

Establishing Maternity Rather Than Paternity

In rare cases, such as those where a child was given up for adoption, a sibling test may also be performed to address whether another individual has the same biological mother, known as a maternal sibling test.

Two Types Of Sibling Test Can Be Done

Are We Full Siblings or Half Siblings?

In this sibling test, we are determining if two siblings who have the same mother also have the same father. The DNA of two individuals with the same biological mother are compared to determine the probability that they have the same biological father. For these tests, it is always helpful when samples from the biological mother are included to also be tested. This enables the lab to determine exactly which genes the two children inherited from their biological father and thereby greatly increases the conclusiveness of the test.

Are We Half Siblings or Not Siblings At All?

In these sibling tests, the DNA of two individuals with different biological mothers is compared to determine the likelihood that they have the same biological father. For these tests, we recommend that samples from one biological mother (it does not matter which one) be tested if possible. This enables the lab to determine exactly which genes the two children inherited from their biological father(s) and thereby greatly increases the strength of the test.

When the suspected father is not available, and you need to know the answer as to who your biological father is, you can be assured that a sibling DNA test is one option that is accurate and easy to do.