Well, I'm disappointed that Severus is a half-blood mostly because it didn't fit my image. However, it doesn't make me love him any less. In fact after a great deal of analysis I've decided the fact that his abusive father is a Muggle is a great justification for Severus' hatred of Muggles.
That said, I can see Lucius and Narcissa knowing. I don't know if Draco knows. I think Bella absolutely doesn't know; based on her reaction when Harry said Voldemort was a half-blood, I think that not only does she idolize Voldie, but she also thinks half-blood is as bad as Muggleborn. Dumbledore would certainly know. McGonagall...hm, probably, if only because she would have known Snape's mother. I suppose technically it might've been difficult for Severus to keep his parentage totally secret, but he certainly wouldn't have gone around talking about it. *nods*
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That said, I can see Lucius and Narcissa knowing. I don't know if Draco knows. I think Bella absolutely doesn't know; based on her reaction when Harry said Voldemort was a half-blood, I think that not only does she idolize Voldie, but she also thinks half-blood is as bad as Muggleborn. Dumbledore would certainly know. McGonagall...hm, probably, if only because she would have known Snape's mother. I suppose technically it might've been difficult for Severus to keep his parentage totally secret, but he certainly wouldn't have gone around talking about it. *nods*