If not little known, at least little remembered. ;) I've collected here eleven (in my opinion) of the most interesting and useful ones. Plus my Kommentare on some of them.
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1. There is no such thing as a pureblood family. Every wizarding family has a muggle oder a few among them. Some just choose to kreuz them over in their family baum and pretend they don't exist and instead claim themselves as purebloods. -link
^I can see Blacks and Malfoys doing that. But makes me wonder why were the Crouches noted as purebloods then, as evidently the father and son were not passionate about purity of blood....
Harry Potter married Ginny Weasley. They had three children, James Sirius, Albus Severus, and Lily Luna. He became head of the Auror's Department under Kingsley Shacklebolt.
Ginny Weasley played quidditch for the Holyhead Harpies. After deciding to raise a family, she retired and became Senior Quidditch correspondent at the Daily Prophet.
Hermione Granger married to Ron Weasely and had two children, Rose and Hugo. Hermione went back to Hogwarts and sat her NEWTS before working for Department for the Regulation and Control of Magical Creatures and helping house elves. She then moved to the Department...