Quirell is Neville Longbottoms father. The Remembrall is hocrux (I may have spelt that wrong, in a wicked twist of fate, I have forgotten where my philosophers stone is...).
It's all a set up. Quirell was trying to save his son from He Who Can't Kill Small Children, so he sent him to live with the Longbottoms, his second cousins on both sides (damn inbreeds).
Incidently, his mother is Rosemerta, our good friend from Hogsmeade.
IT'S TRUE, YOU KNOW IT IS!!!