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. If a kinship test is performed and the result is not conclusive enough, Y-DNA STR testing can be considered as a supplemental test type for the kinship test. All males who have descended from the same paternal lineage will have the same Y-DNA STR profile. If two males do not have the same Y-DNA STR profile, it would conclusively confirm that they are not related along their direct male line.
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