Spock and Sherlock related?

dduane:

tea-at-221b:

How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?”
-The Sign of the Four

“An ancestor of mine.”

So now we’re all left wondering …

(a) how Amanda Greyson is related to Sherlock Holmes

…or else…

(b) who among SH’s ancestors or descendants (?!) marries a Vulcan.

…”My brains hurt.”