Petunia knowing Dementors

[feuerzahn_17]

No: HPFGUIDX 75242

Hi,

I was looking through the messages, but i did not find anything about 
that.
When I first read the part about petunia knowing dementors I thought 
that she probably knows them, because they "killed" her parents.that 
is why she knows that they suck peoples soul.It is said somewhere in 
the books that dementors were involved in the worst muggle killings 
during the first war.
did anyone of you think the same?could be possible,couldn`t it?