I don't think it's necessarily true that Hermione never discusses her parents, any more than it's true that Harry never shaves or brushes his teeth. She could talk about them all the time, but if it has nothing to do with the plot (and JKR has made it quite clear that the elder Grangers have no plot relevance), it's not going in the books. People expect the books to be encyclopedic, and they're not.
That being the case, it's entirely possible that Hermione does have friends from primary school that she writes to and hangs out with during the holidays, and we simply don't hear about them because they aren't important.
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Date: 2005-10-15 06:42 pm (UTC)From:That being the case, it's entirely possible that Hermione does have friends from primary school that she writes to and hangs out with during the holidays, and we simply don't hear about them because they aren't important.