Slytherin Heir

[Jacqui]

No: HPFGUIDX 101695

When I first heard this I thought it was an honest mistake...but I 
found this in an interview with JKR:

Harry Potter for grownups again! Is Voldemort the last remaining 
ancestor of Slytherin, or the last remaining descendent of Slytherin?

Ah, you spotted the deliberate error. Yes, it should 
read "descendent." That's been changed in subsequent editions. (Keep 
hold of the "ancestor" one, maybe it'll be valuable one day!)

Interesting...

Jacqui