Who should be tested?
Ideally a paternity test analyzes specimens from the mother, the child and the alleged father. If the mother is unavailable for testing, the test can still be performed without her, which is normally more expensive, time consuming and less reliable. The mother is used to identify the parts of the child's genetic information that came from her. The remaining parts had to come from the biological father, and the comparison is then possible with the samples from the alleged father.
If the alleged father's specimen is not available for the paternity test, then you can test known relatives of the alleged father. It is helpful if the alleged father's parents are available for testing. If the alleged father is deceased, it is sometimes still possible to obtain his biological specimen. If the death is recent, sometimes the coroner or hospital will have retained a tube of blood from the decedent. As a last resort it may be possible to exhume the body, but there is no guarantee that the specimen will actually work.
hen there's more than one possible father for a given child and the possible fathers are related to each other, it is important to test them all. This would be the case, for example, if two potential fathers are brothers or father and son. The paternity test of a single alleged father only identifies a probability of paternity for that alleged father compared to other unrelated men. If two possible fathers are closely related, then their genetic makeup can be very similar, and they could both receive a positive test result. In that case, the laboratory will continue testing until one of the alleged fathers is excluded.
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