I don’t think these tests are accurate. Besides for Africans, most people globally are descendents of immigrants and mixed races. How do they have markers to test these “races”? The Sephardi and Ashkenazi groups are only a few hundred years old, how can they test Ashkenazi and Sephardim ancestry (as opposed to Michzrachim that were a distinct group from hundreds of years longer)? Sephardim have lived in Europe, not only in the Middle East and Africa, since the Spanish Inquisition, so how can they tell apart people by their genes when they lived on the same continents and in the same countries? Are minhugim part of their genes?
Identical twins and triplets who took these DNA tests often had completely different results from one another and regardless of all these “scientific” explanations, I’m not buying it. Siblings, especially if they are identical, should have the same, or very similar, genes makeup.