Harry Potter Genealogy

I just finished the last Harry Potter book, and was thinking about genealogy and family history stuff and decided to see whether anyone has written up the family trees in the books. This newest book should give plenty of data to work with. Trying not to give too much away about the plot, there are cemetery inscriptions, obituaries, births, and general family histories in Book 7.

Since wizarding lines showing "pure" wizarding blood (not mixed with Muggle or giant blood) are valued highly by some, genealogy is rampant in the wizarding community. A wizarding community genealogy (Nature's Nobility: A Wizarding Genealogy) is even listed by this site, as among the texts mentioned in the Harry Potter books. Plus, like many insular communities, genealogy might help if you are worried about marrying your cousin.

Nonetheless, there does seem to be some confusion among Harry Potter fans at least about what "half-blood" means. Here's an example. Say you are the child of a Squib and a wizard. I think you are pure-blood. But what about the child of a wizard who married a half-blood. Well, if any of your grandparents were Muggles, you are a half-blood too, despite being actually only a quarter muggle.

I went looking for trees online to see whether anyone had traced all the trees mentioned. Of course they have...

Harry Potter's Family Tree
Harry Potter Lexicon
Rootsweb's WorldConnect Project: Harry Potter Genealogy

and here's one for J.K. Rowling.

No promises about accuracy, and I suspect all the new data from Book 7 hasn't been added to these trees.