Is Harry really a halfblood? Or a 100% pureblood?

[jastrangfeld]

No: HPFGUIDX 84970

I have been thinking about this.  And I did not see anything about
this really, except discussions about his being a halfblood, so please
forgive me if this has been discussed.

I got to thinking about Jeremy Paxman's interview with JK, where she
says that no one has ever really guessed the truth.  That some have
skirted it, but not gotten there.

And I'm rereading OOTP and I got to thinking.  What if, mind you, what
if Petunia were really a Squib?  What if Harry isn't a halfblood at
all?

For instance, on p205 of OOTP (US version) in the sorting hat's song.
 I think there's a clue!  "Slytherin took only pure-blood wizards of
great cunning, just like him."  We know the sorting hat wanted to
place Harry into Slytherin.

And Voldemort.  Now we know his dad was a muggle.  But was he also in
Slytherin?  So do they then consider him a a pureblood because of his
mother?

If Petunia is a Squib . . . 

Well I'm not entirely 100% certain where to take this.  But I'm
wondering if anyone else caught onto this?  Am I making sense or udder
nonsense?  They also refer to Harry as coming from one of the ancient
families don't they?

What do you think?

Julie