About Dumbledore...this topic came up quite a few times over in the Leaky Lounge, actually. I'd like to think the secret dies with them, only because I got that impression when Sirius and Lupin were yelling at Wormtail back in book 3. They're not using the house as HQ anymore though, are they?

(They actually left it as "aniki" and didn't translate it? No fair...they translated it as "brother" over here...)