Quantie I don't think you understand the points of contention. Do you know what haplo means? Half? As in haploid, as in half of the required genetics? As in descended from one parent? Nobody is saying that you can't trace a line of definite parents from the paternal y chromosome lineage or through mitochondrial dna. The guy said as much in the video. Nobody is saying that people from the same genetic cluster won't share genetics, because genes can obviously exist in two places at once. And, of course, they will tend to where their haplogroup is the same, especially when purebred.