Well,that is an interseting thing...
Now, I woudl guess taht Mrs Figg is of the generation of Snape and Harry's parents and Sirius and Lupin etc. Maybe not the exact same age, but that generation. So her partent would have to be aroudn McGonagall's generation. It can't be McG, otherwise... well, McG doesn't seem like the type of person who wouldn't see her daughter very often, and being as strick as she is, I cant' see her raising a child that would go to a meeting of the Wisegomort(sp) in her slippers!!!
But is she is a squib (well, she is a squib!) then both her parents must be wizards. If oneof them was a muggle, then she woudnt' be a squib. So I wonder who they were. If the Mrs refers to the fact that she was married, then her father's name woudlnt' be Figg. I can't see her husband (if she had one) as having been a wizard though. Remember the Wizegomort said that there had been no other witches/wizards living around Harry's area. So unless she moved after he died, I'd say he was a muggle.
Anyways, how was that for a bit of a lengthy analysis without actually coming up with anything!!!
Holly
