Sibling testing is usually done by people who wish to know whether they share the same biological mother or father (in most cases, the father is in question although we have had cases where sibling wish to know whether they share the same mother).

 

  • STR Testing (short tandem repeat testing): this test is carried out when test participants are male and female.  To maximize the accuracy of laboratory analysis, we always recommend including a sample of the know parent in a sibling test.
  • In cases where siblings are male and wish to know whether they have the same father, we suggest Y chromosome testing. This test is extremely accurate between agnate relatives as males born from the same father will have the same exact Y chromosome genetic blueprint. We do not require the mother’s sample for this test.
  • Female siblings who wish to know whether they share the same father can do an X chromosome test. If females have the same mother then we will also need her sample for a conclusive analysis. X chromosome testing between siblings from different mothers does not require a sample from the known mother.
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