[HPforGrownups] What determines whether a muggle born will happen?

[lil.magill at adelphia.net]

No: HPFGUIDX 161386


---- ghost_silver_wolf <ghost_silver_wolf at yahoo.co.uk> wrote: 

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Is their a genetic factor involved in the muggle family, or is it
purely random?

I believe there might be a slight genetic factor, the Creevy (sic)
twins  both been wizards.

Marion here:

This has always been an inconsistancy that bothers me a bit.  The emphasis is on "blood" but you've got Hermione, for example, who has no other wizards in the family, Harry, who's considered "pure blood" but whose maternal grandparents are probably muggles, and Filch, who comes from a wizard family but is a squib.  So my contention is that blood has nothing much to do with it.  And in that case, how can there be so much discrimination based on "blood"?  

Marion