Muggle borns at Hogwarts

[mjanetd]

No: HPFGUIDX 173257

Why was Colin Creevey still at school during the battle at Hogwarts?  
Wasn't he and his brother muggleborn?  I remember their father was milk-
man.  Why would they allow mud-bloods at school when they were taking 
wands away from muggle-born adults?

And another question.  Someone mentioned in another thread that the 
Dursley's died when Diggle's house blew up.  I've only read DH once so 
the little details are vague.  I'd hate to think the Dursleys died.

Janet