Sevens.

[secca_pk]

No: HPFGUIDX 159891

random832 wrote:
<snip>
> Secca again:
> > JKR: The backstory with Ginny was, she was the first girl to arrive
> > in the Weasley family in generations, but there's that old tradition
> > of the seventh daughter of a seventh daughter and a seventh son of a
> > seventh son, so that's why she's the seventh,
> 
> Well, apart from being in fact the first daughter, those old
> traditions don't, as far as i can tell, include anything about the
> seventh son/daughter/child of someone who was not a seventh whatever
> him/herself.

Secca replies:
Well, this is Jo's world being discussed, and her quote... So when she 
said this, I took it that *she* meant 'seventh child of a seventh 
child'... being a very modern and Politically Correct interpretation of 
the old wives tale (Which, BTW, is *not* how I personally feel the 
addage was meant 'back in the day'.)

This infers, in my opinion, that Jo must feel Molly Prewitt was also a 
seventh child. There is nothing in Canon that specifically precludes 
this possibility.

Back to topic: 
I also have never put much store by the number seven in the books. 7 
and 12 are reputed to be magical numbers, historically. So Jo has used 
them many times in her own 'magical' works...

Now 17 Sickles to a Galleon, and 29 knuts to a sickle; Here we have a 
different story! This implies that Wizard!Math is base(439) rather than 
base(10); which implies that a midget wearing glasses is being born... 
(The Seventh Son?)