All of the kids left home long before they turned 18. This left the adults to duke it out with each other.
As a young adult, I blamed her for not leaving him, for putting up with the abuse. I would see her oscillate between being his drinking buddy (which seemed to pacify him) and trying to be sober, which made her a "you think you are better than me" target.
Then he turned 60. Suddenly the raging alcoholic turned into sweet little old drunk guy. He quit fighting anyone and this created a crisis.
She had lost her fighting partner. For maybe two years, she constantly tried to needle him into a spat. The illusion of Audrie as the victim was dispelled.
They loved each other, no doubt, but it was with such ferocity that it could look like hate.