Class origins

[David]

No: HPFGUIDX 29397

In chat last night somebody speculated about the class origins of 
MWPP, and how these may have affected their relationships among each 
other and with Snape.  I thought this was an interesting speculation, 
so:

Do you think the class background of any of the characters matters?  
Why?

Do you have an opinion on the class origins of any of the main 
players: the Trio, MWP, Dursleys, Snape, Neville, Hagrid (at least, 
his Dad), Dumbledore, McGonagall, any others?  Again, why?

I have a few opinions on the above but I will await responses first.

David