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How certain are the results when the tested individuals ARE true paternal grandparents?

April 26, 2017certain grandparents individuals paternal results tested

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How certain are the results when the tested individuals ARE true paternal grandparents?

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The average probability of grandparentage for our DNA Test is far in excess of 99.9%. We guarantee greater than 99.9% probability of grandparentage in all tests (or, we prove that the tested individuals are not true grandparents) where the child and both alleged grandparents are tested.