Professor Snape IS Regulus Black
Whaddya know, I've forgotten the other one!!!
I can't remember offhand and I've lent out OOTP...is Bellatrix a sister or a cousin of Sirius Black? Did Sirius have any siblings besides Regulus?
Bellatrix is a cousin. Narcissa Malfoy is her sister, so also Sirius' cousin. And the third sister, I think, is Andromeda, who was Tonks' mother (and Sirius' favorite cousin). Per the tapestry, I believe Regulus was Sirius' only sibling. I think Dumbledore refers to that fact as well when discussing Harry's inheritance from Sirius; at least I do recall he mentions Regulus being childless.
I have to go back and re-read this whole thread; I am really enjoying it. Has anyone else wondered about Lily Evans' history? I've always wondered about her having red hair, like the Weasleys (of course, if they're related, bad news for Harry and Ginny!).
Finally, if Regulus did take the locket, who was with him when he did it? Wouldn't it have to be someone who was gifted enough to re-make that potion? I wondered about that, too, given Slughorn's rhapsodies about Lily's amazing potion making abilities.
Professor Snape IS Regulus Black
That is pretty outlandish. I reread GoF, and have about ten pages left on my OOtP reread.
I think Snape is Snape, but there was something I read in OOtP that caused me to wonder if Dumbledore is really dead-I've thought from the get-go that Dumbledore IS dead. It wasn't Bellatrix Le Strange's comment that you have to really mean the unforgiveable curses, it was something else. (which I forget at the moment, but will look up after I finish the whole book)