Lupin's dad??

[ge25y]

Hello, I'm a fairly new poster and just want to say first of all how 
much I love reading everyones ideas.  It's great fun while we wait 
for HBP.  Beyond that though I'm curious where the Lupin Sr idea 
came from.  I don't remember anything in particular being said about 
his family at all really.  I mean we know he has parents but other 
then the passing remark of them in POA not thinking he would get 
into Hogwarts I don't remember anything being said.  Any special 
reason why he came to mind while reading the description?
Look forward to a response
Jennie