Muggle born magical sibs?

[heather the buzzard]

No: HPFGUIDX 130177

Donna wrote:

> <snip>  Then in GoF, US version, page 174, chapter "The
> Triwizard Tournament", Colin says:  "Harry, guess what? 
> Guess what, Harry? My brother's starting!  My brother 
> Dennis!".
>
> If Colin is muggle born so would his brother be.  Isn't 
> it a bit unusual for sibs from muggle families to be 
> magical?  If sibs from muggle families can be magical, 
> isn't it possible for Petunia to be magical, too, but just
> reject it?  We know Petunia knows more about the ww than 
> she lets on.  


I think it's possible -- if for instance, muggle-born wizards are just 
random, say 1 in a million births -- then it's highly unlikely for 
siblings to be magical.  Unlikely, but not impossible.  Colin and Dennis 
would be like the lottery-winners.  Perhaps there's something important 
about them, though, that will be revealed later.  I mean, they haven't 
had any major roles yet, they are side characters.  Perhaps JKR is just 
waiting for something, some big reveal about them.  :)

Perhaps there is also some magic in their family history that they 
didn't know about.  Maybe their grandmother was a witch who was shunned 
from the WW and decided to live life as a muggle and never told her 
family.  Her children were squibs but then the grandchildren were 
full-fledged wizards.  I'm stretching, perhaps.  Heh.

But at any rate, I don't think that Colin and Dennis would be any 
indication that Petunia would have magic too.  If she had, then she 
would have been invited to Hogwarts as well, and canon suggests that she 
was not.

Are there other examples of muggle-born wizards with non-magical 
siblings?  We know that Seamus is half-blood (but is he a prince?  heh) 
but does he have any siblings?  Hermione seems to be an only child.  
Anyone else?

heather the buzzard