The Mauraders' Generation -- no parents

[Lisa (Jennings) Mamula]

No: HPFGUIDX 123329


Maybe this question has been posed before, but I haven't seen it here.  If this 
is the case, please point me toward the appropriate thread and forgive my 
ignorance. :)

I know that the HP stories center around the Trio and their peers, but what 
about the generation above them?  Where are the parents of these 
characters?  

Molly & Arthur -- Do the Weasley kids not have any grandparents?

Sirius -- We know they are dead, but how?  Sirius is young; it seems his 
parents would be too young to die of natural causes.

Tonks -- So, her mum Andromeda was Sirius' favorite cousin... Where is she 
now (and where is her husband, Ted)??

Remus -- Any clue there?  

James -- He was so very young when he died; what happened to his parents?  

Lily & Petunia -- Another mystery.  

Vernon -- Also no mention of parents (that I remember).  Vernon and Petunia 
(and Marge) being the way they were toward Dudley, surely Vernon's parents 
would have been just as doting (read: disgusting).  So where are they?

Just wondering what you all know/think.
LisaMarie