OOP: Weasley vs. Black and families in general

[rowena_grunnionffitch]

No: HPFGUIDX 67597

   I wonder if that accountant second cousin might not have been a 
Squib rather than a Muggle? Ron says, jokingly, that the family 
doesn't talk about this mundane relative yet he just has in casual 
conversation with a new acquaintance. Sounds to me like he's 
repeating a family joke, they aren't really ashamed of the accountant 
even if the rest of the Wizarding World thinks they should be. In 
fact they may know him rather well given Arthur's interest in the 
Muggle world. Judging by the way he latches on to Harry and the 
Grangers he's unlikely to have overlooked a second cousin by marriage 
living in the Muggle World.

   As for Molly and Arthur both being purebloods, that was probably 
sheer chance. They just happened to fall in love with another member 
of an old Wizarding family, as opposed to deliberately setting out to 
find a mate among such.

  And what exactly is meant by 'pure blood' anyway? How many 
generations does it take to erase the 'taint' of Muggle ancestry? 
Harry for example is called a 'half blood' because his mother was 
Muggle born but what if he marries a 'pureblood' like Ginny, you 
could scarcely call their children 'half-bloods' could you? After 
another generation it might well be forgotten that Lily was Muggle 
born at all. 

   I would guess that even consiously elitist families like the 
Malfoys have any number of forgotten Muggle ancestors hiding in the 
family cupboard.