Sibling tests prove useful when parents are not available for testing for one reason or another. In such cases siblings can be tested to determine their relatedness. This type of DNA testing has been used successfully in cases of disputed estates when a parent has passed away and siblings need to be verified as part of a disputed will. In more complex relationship testing Grandparents can be used instead of parents if their samples are not available. At polygenyn Ltd we provide reliable ethnicity, sibling and complex relationship tests. These tests take up to 3 weeks before they are reported due to their complexity.