Your comments are over the top. In re her grandma, the author was convinced by "science" but it turns out the claims made by 23 and Me were essentially a lie, in that they were given with far too much illusion of certainty.

In re the "probably total junk" comment, that's in reference to this: "companies are popping up every day, promising to use your DNA for everything from figuring out what wine or marijuana varietals your genetics predispose you to, to what skin care regimen is best for you". And the quote is spot on. There may be research pointing vaguely in those directions, but the reality is far more complex. And the chances that the actual science will appropriately inform the recommendations give to you by startup companies built around trying to make money off telling you "facts" like these based on your genome, it will absolutely and without question translate to "junk". Even if they could make correct predictions, there would be so much more money in bending the truth just a bit to satisfy advertisers and affiliates, that the end result would be junk, not science.