Unless the child is a Squib and the parents are fairly enlightened, I don't imagine they'd have any any reason to want their kids to "pass" among Muggles.
I certainly don't have any textual evidence, but I can imagine a pureblood wizarding family so paranoid about other wizards (long history of feuding with another family?) that they would like to be able to hide. Or that fear the destruction of the wizarding world by Voldemort or similar and want to be prepared for a new way of life. Or are just highly eccentric. So, not very likely, but it could happen. :)
I'm a little unclear on the definition of pureblood anyhow. Sometimes it seems to mean old wizarding families, like the Blacks. But other times, simply someone whose parents are both wizards, like Harry, whose mother was Muggle-born.
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I certainly don't have any textual evidence, but I can imagine a pureblood wizarding family so paranoid about other wizards (long history of feuding with another family?) that they would like to be able to hide. Or that fear the destruction of the wizarding world by Voldemort or similar and want to be prepared for a new way of life. Or are just highly eccentric. So, not very likely, but it could happen. :)
I'm a little unclear on the definition of pureblood anyhow. Sometimes it seems to mean old wizarding families, like the Blacks. But other times, simply someone whose parents are both wizards, like Harry, whose mother was Muggle-born.