It’s pretty obvious that few of you are actually reading the whole story - and consequently, you’re jumping to conclusions. DNA in this case is not to prove who it came from, but only that two of the bodily remains with the right names on the ossuaries were not related by blood, hence not eliminating the possibility that they were a married couple (since they were in the same tomb).
I have not seen the documentary yet, but we’re talking statistical evidence here, ie what are the chances that one tomb in Jerusalem would contain exactly the right names, and that the ossuaries for the Jesus person and the Mary person would be the ones not related by blood? It’s not proof, but it’s certainly enough to at least generate some serious discussion.
As to why they didn’t consider this when this tomb was first discovered in the early 80’s, who knows, maybe for the same reason that the Dead Sea Scrolls were kept secret for all those years. But that they didn’t back then is irrelevant to the discussion. We’re not back then, we’re now, and we have the tools of today.