While DNA parentage tests (paternity test and maternity test) can always provide an absolutely conclusive result regarding parentage, other relationship tests types are not as discriminating as the DNA parentage tests. DNA Sibling tests, Grandparentage tests, Aunt/Uncle tests and Cousin tests are usually only ordered when the parents are not available for testing and there is no other choice but to test other relatives because these tests are not as discriminating as a parentage test. If a kinship test is performed and the result is not conclusive enough, mtDNA testing can be considered as a supplemental test type for the kinship test to see if individuals are linked on their maternal line. All individuals (both male and female) who have descended from the same maternal lineage will have the same mtDNA profile. If two individuals do not have the same mtDNA profile, it would conclusively confirm that they are not related along their direct maternal line.
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