*shrugs* I'm just ignoring the Black sisters' birth years. If you remove Bellatrix from that period, you lose one of the main reasons Snape became a Death Eater. Or there's the crack theory I just added up there ^_^

The Walpurga thing suddenly leapt out at me. Even if there's no direct connection, that whole generation of Blacks are Tom Riddle's contemporaries, which is just fascinating.