The rest of the evening had been spent in deep discussion of the Potters. The Cloak, Harry had learned, had been in the family for generations. Even Charlus didn't know how many Potter fathers had given it to their eldest son on the day he received his first wand. Apparently Invisibility Cloaks were forbidden at Hogwarts, but there was some kind of exception for family heirlooms: as long as Harry didn't try to hurt someone using it, the staff couldn't take it away from him.