Aware of Snape's bloodline. Dumbledore, certainly. Probably McGonagall, and any other staff members old enough to have been around the school (as either teacher or pupil) when Snape was there. Lucius - Snape wouldn't have told him, as he was so much older he probably didn't have much to do with Snape at school. It depends on whether all the purebloods know the names of all the pureblood families. If so, then Snape's bloodline is an open secret. I incline to think that most pureblood families would be familiar with the majority of other pureblood lines, but that there were sufficient gaps in their knowledge to be able to say things like, 'Ah, but there was a cadet branch of the Wimblefloops who changed their name in the 1600s and I'm descended from them' or 'Ah, Snape is an anglicisation from a cadet branch of some random European pureblood family'. I imagine the Marauders wouldn't know, otherwise they'd taunt him about it. Voldemort would know, because Snape would probably tell him, as a cunning psychological move to show how purebloods needed to be able to lord it over Muggles appropriately. Half-blood Slytherins probably know Snape's a half-blood, as he may have told them, in an effort to shove the house away from its unnatural obsession with bloodlines.
no subject
Lucius - Snape wouldn't have told him, as he was so much older he probably didn't have much to do with Snape at school. It depends on whether all the purebloods know the names of all the pureblood families. If so, then Snape's bloodline is an open secret. I incline to think that most pureblood families would be familiar with the majority of other pureblood lines, but that there were sufficient gaps in their knowledge to be able to say things like, 'Ah, but there was a cadet branch of the Wimblefloops who changed their name in the 1600s and I'm descended from them' or 'Ah, Snape is an anglicisation from a cadet branch of some random European pureblood family'.
I imagine the Marauders wouldn't know, otherwise they'd taunt him about it.
Voldemort would know, because Snape would probably tell him, as a cunning psychological move to show how purebloods needed to be able to lord it over Muggles appropriately.
Half-blood Slytherins probably know Snape's a half-blood, as he may have told them, in an effort to shove the house away from its unnatural obsession with bloodlines.