JKRs comments on Petunia

[esmith222002]

No: HPFGUIDX 111884

I continue to be very interested in the 'Evans' family history. JKR 
seemed to be indicating that 'Petunia the squib' was fairly close to 
the mark. Correct me if I'm wrong, but I'm sure a squib is a non-
magical person with two magical parents. Therefore, could Petunia be 
a non-magical child with only one magical parent! There seem to be 
number of possibilities here. Since Evans must be a muggle surname, 
which would have come from the father either;
1. Petunia and Lily's mum was a witch (unlikely due to the whole 
mudblood thing!) or
2. Petunia and Lily's father was a wizard, who for some reason left 
the scene, to be replaced by the stepfather - Evans (could explain 
JKRs interest in the Petunia-squib comment) or 
3. Lily's mum had an affair with a wizard and she was the result 
(whether Lily's mum told Mr. Evans/Petunia, I wouldn't know!!!)

Any thoughts??

Brother Fry (who remains convinced that Lily is descended from 
Gryffindor)