I'm not sure this is trying to say the dad is okay and the mother is trash...
In Chapter 43, the dad skipped his daughter's play, and then laid his mental problems on his daughter, while the mom supported the daughter at her play, and said something uplifting to her at the aquarium.
I Chapter 44, the mom was saying harsh things to her, and ignoring her, while the dad actually said something uplifting to her.
I'd say the rolls of the parents swapped 180 degrees in the chapters. The second to last page seemed to be emphasizing that as well
It's still perfectly possible that the dad became bitter at being tied down with a family, and the mom became bitter at him leaving his family.
For all those wanting her mom dead though, I doubt she wants that....it would probably screw her up even more.