To be sure, the intrinsic value of the "Holy Grail/Holy Blood" does not necessarily equal directly or literally any such value for the current "royals" on the world stage including the British royal family. Strictly in terms of DNA it's probably meaningless. It's more about symbolism and hidden streams of ancient tradition/knowledge typically more available to the "elite". What's actually really meaningful and valuable is that knowledge itself that's gone underground regardless of who actually possess it now. And it is this shrouded knowledge...