Pure Blood Parentage

[clarinut76]

No: HPFGUIDX 75662

I haven't posted in a very long time, but I've been avidly re-reading 
all the Harry books in order.

Here's a question I've come to again and again, and JK has never 
really explained it very well.  Perhaps this has already been 
discussed, I can't be sure.

How long are you a half-blood?  I mean, if James was born from two 
wizards, he'd be a pure blood (we've never heard mention anything 
different) and Lilly seems to come from a muggle family (lots of 
debate on this, I'm sure...).  Harry is considered a half-blood for 
this reason, but since he's born of a wizard and a witch, couldn't he 
be thought of as a pure blood?  Is the muggle blood thing always 
there?

I'd love to hear your answers on this!

Cheers,
Rachel