J.K. Rowling updated Pottermore with some new information about the Dursley family from her famous Harry Potter book series.
In the new piece, the author writes that the Dursley family is, “reactionary, prejudiced, narrow-minded, ignorant and bigoted; most of my least favorite things.”
Concerning Aunt Petunia and Harry’s final goodbye in the series, J.K. says she wanted “something decent (a long-forgotten but dimly burning love of her sister; the realisation that she might never see Lily’s eyes again) almost struggled out of Aunt Petunia” during the moment, “but that she is not able to admit it, or show those long buried feelings.”
J.K. also explained lots of back story about the family, including a disastrous first meeting between Aunt Petunia and Uncle Vernon and Lily and James Potter. James and Vernon immediately did not get along.
It’s also revealed that Vernon hated Harry because he looked so much like his father.
J.K. also wrote about how she named the characters of Vernon and Petunia. Vernon was “a name I never much cared for”, and Petunia “the name that I always gave unpleasant female characters in games of make believe I played with my sister, Di, when we were very young.”