when harry gets home after the dementor attack his aunt surprises every one by telling dementors guard azkaban.
when asked how she knows she states that she"overheard him telling her"
to which harry says
"if u'r talking bout my parents then say their names"
however in the 7th book when harry saw into snape's memory after his murder he saw that lily and snape were under a tree and snape was her about the dementors and after a few moments petunia fell out of the tree they were under
which means that petunia actually overheard snape and lily
so in the 5th book how could petunia mean james and lily potter???when mentioning where she got that information.
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