Sibling relationships vary depending on whether the brothers and/or sisters involved share both biological parents or just one parent. We also need to know which common parent they have, if any, and whether any of the known parents are available for the test. EasyDNA New Zealand has handled some of the most complex cases, sometimes involving multiple siblings.
Test results are intended to provide a statistical likelihood that gives evidence to support the tested relationship in question. Providing additional parties to be tested (for example, a known parent’s sample) or performing direct relationship testing may provide additional evidence.
Generally, sibling tests are carried out for peace of mind. We do however, also offer legal siblingship testing of which DNA test results can be used to support legal documentation and evidence of proof of relationship as might be required in court cases. The price for the Sibling Test is $699.
We strongly suggest including the sample of a known mother to provide stronger results.
Types of sibling testing
Our Y chromosome test can only be carried out between males. If two siblings think they share the same father and wish to find out, this test is ideal. If siblings are male and want to determine if they share the same father or their shared male lineage, this is the idea test to carry out. Find out more about Y chromosome testing.
Only females can carry out X chromosome testing. Ideally the test is carried out between females with different mothers who need to know if they have the same father. However, X testing can also be carried out succesfully between sisters with the same mother if the mother’s sample if available; without the mother’s sample we will be unable to provide this test. Read more about X chromosome testing.
Twin siblings curious to know whether they are monozygotic or dizygotic can do so with our twin zygosity test.
Siblingship testing results are available in 7-10 working days receipt of samples at the laboratory. We can only guarantee standard result turnaround time when testing takes place solely using oral swab samples. Using a discreet sample for your test may lead to an increase in turnaround time.
In cases of sibling testing, we always recommened including the sample of the mother, if available. This will help us with our analysis. We do not require the mother’s samples for the Y chromosome test as for this test we only analyse Y chromosome specific genetic markers.