Family DNA testing, sometimes called "Genetic Profile Reconstruction," is used to test the relationship between a child and biological relatives of the alleged father, if he is deceased or unavailable for testing.
Family DNA testing is used to test the relationship between a child and biological relatives of the alleged father, if he is deceased or unavailable for testing. There are several different scenarios for family DNA testing. An ideal situation would be to test the mother, child, one parent of the deceased, and one or more full siblings of the deceased. We can also perform the test if we have two full siblings of the deceased, the mother, and the child.
Generally speaking, biological-relationship testing such as family DNA testing and sibling testing is not as definitive as DNA parentage testing. It is not possible to determine with absolute certainty whether two people are siblings or biologically related in some way other than the parent-child relationship.