OOP: Weasley vs. Black and families in general

[susannacedric]

No: HPFGUIDX 68824

--- In HPforGrownups at yahoogroups.com, "Robert A. Rosenberg" 
<rarpsl at o...> wrote:
> At 17:02 +0000 on 07/05/2003, rowena_grunnionffitch wrote about 
> [HPforGrownups] Re: OOP: Weasley vs. Black and families in :
> 
> >Harry for example is called a 'half blood' because his mother was 
Muggle born
> 
> What evidence exists for her being Muggle-Born as opposed to being 
> Squib-Born? I have the impression (without going back and reading 
the 
> books again) that the Muggle vs. Squib status of the Evens is based 
> on Petunia (who wants nothing to do with the WW [which if he is a 
> Squib with a Wizard Sister would be a case of Envy/Sour-Grapes]) 
and 
> Drago (who has a "pure-blood" fixation that would lump a Squib 
> Ancestor in the same group as a Muggle Ancestor [ie: A Squib is not 
> "pure-blood" since the Wizardy Power did not Breed True]).
> 
> 
> --
> 
> Bob Rosenberg

ME:
In OOP Petunia lets it slip that she knows about the dementors, and 
her explantion is :

"I heard -that awful boy - telling HER about them - years ago."

So apparently neither Petunia nor Lily knew about the dementors 
before James told them. If Petunia is a squib, meaning she grew up 
with at least one magic parent, wouldn't they have known about the 
dementors already? I am sure that is a common knowledge in the WW.
Any thoughts?

Susanna