Paternity Testing on Siblings
Key Points
  • Sibling DNA testing is often difficult and time consuming to ensure correct probability calculations of similarity or relationship.

Sibling Study

A sibling study is where you obtain DNA samples from additional brothers or sisters of the same alleged father to determine if the biological father for the tested group is common. The test is enhanced if samples are provided from each child’s mother.

The results of a sibling study report the percentage of probability of their relationship. If it is known that the tested subjects are from the same mother, then a 50% response (half siblings) would indicate that they have different fathers, and 99% would indicate that they have the same father (full siblings). Results can vary from .001 (no relationship) to 99% (full sibling). This is a very difficult test, and most labs require several weeks to complete the test, the hand calculations, and the report.



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SETTLED MATTERS -- Courts have universally decided that a man’s allegations that a woman deceived him (about fertility and the use of birth control) are completely irrelevant to paternity and support. A man is, as one legal observer puts it, "strictly liable for where his sperm ends up when he voluntarily engages in a sexual act." The doctrine of strict liability emanates from cases where men voluntarily impregnate women at their request.

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