Sibling DNA testing is done when we match the DNA to determine sibling relations. Through sibling DNA testing, we can find if two individuals share the same biological father and mother or one of them. This testing is also used as court-admissible DNA testing to know various legal issues like child support, tax forms, adoption, birth certificate changes and many more.
A sibling DNA test is done on 3 bases:
- Full sibling vs Unrelated: In this case, sibling testing is done only to verify that the given individuals are full siblings or not. If they share the same biological mother and father then they are full siblings.
- Full sibling vs half-sibling: Here, this test is done to determine whether given individuals share the same biological mother and father or one of them. If they share the DNA of only father or mother then they will be half-siblings.
- Half-sibling vs Unrelated: This type includes to determine if particular persons share the DNA of one of mother or father or none of them. If given individuals share one of the biological parents then they will be called half-siblings and if both mother and father not matched then they will be unrelated to each other.