Relationship DNA Testing – home test kit costs about R150 – the actual test is a lot more. This DNA test from South Africa tests the relationship between brothers and sisters – whether they are from the same father – Grandfathers and who their grandchildren are. It tests whether sisters and brothers are from the same mother. It is an easy test and just needs sample from the people you want to test.
The home DNA testing kit tests for the following:   

Tests DNA – Brothers from the same father – called testing for Y chromosome testing
Tests DNA Brothers from the same Mother – called testing for mDNA test
Tests DNA Sisters with the same Father – called testing for Paternal X
Tests DNA Sisters with the same Mother –called testing for Maternal X
Tests DNA DNA Brother and sister with the same Mother -called testing for  mDNA
Tests DNA Grandfather related to Grandson – called testing for Y
Tests DNA Grandmother related to Granddaughter – called testing for X
Tests DNA Brother and Sister with same Father – called testing for DNA Loci

As you can see it is quite extensive – it is used when you are not sure who your family is or who your siblings are and if you come from the same parents. What can I test with DNA? You can aslo do an infidelity test with DNA tests from South Africa.