Is it ever said what house or houses they are from? Curious if Slytherin is the only one that turns out a dark wizard...

Amy

I was wondering that too. It does seem though that they are all pretty much from Slytherin though.

Sue

Are they all Hogwarts graduates? After all not all wizards and witches go to Hogwarts or one of the other Wizard schools.

Where is the American branch of the wizarding school? Is there one in Africa? South America?