This is a very good point. I'm thinking there are tons of different exceptions because, hi, how can Muggleborn witches and wizards be told? Their parents definitely know, and if you were a wizard who married a Muggle, then you'd let them know too. Seamus' mum told his dad eventually, though he never did say how-- Dean's dad never told his family though (and if I'm not mistaken JKR has mentioned she had a whole backstory for him; basically, Dean isn't Muggleborn like he thought, his dad was a wizard who went into hiding or something like that) so maybe it's on a case-by-case basis? McG also never told the Muggle she was in love with, so I'm guessing the Statute played a part maybe a long time ago? And I think maybe the Ministry has this blanket rule of "if you think it's going to be a problem, you can Obliviate Muggles who find out" or something.

Evyclaw