"I've always been bad at arguing. Cassie was always good. I preferred it that way. She was always convincing me to do things I didn't want to do. I convinced her of nothing. I didn't mind - I didn't want the responsibility. I knew - from my own experience of being convinced - that while it is possible to win people over to your opinion, this is only a good outcome superficially. Because after a while, some tiny thing will go wrong, at which point they will revert to their earlier viewpoint, and resent you for bullying them out of it (and for exposing their weak will - so you won't have won after all).
If Tim didn't want my children then I wasn't going to argue. I just wouldn't have children.
I informed him that I'd return the following day to collect my thesaurus, my thermal vest, and other essentials. It occured to me that I now had the rest of my life to correct the nation's grammar. I should feel grateful that - at least, within my head and possibly a notebook, in which I'd detail each mistake and my amendments - the world would now be orderly, regulated and error-free. i also had to think about keeping myself warm, as there was no one else to do it. The next afternoon, I found my belongings in a plastic bag on the doorstep."

Our first person narrator for that chapter, Lizbet, walks away from the house with a face like a barracuda, and as the story resolves she reassesses her relationship with her sister Cassie, and fixes the hurt she caused Tim, and even how she is relating to her miscarriage and her attitude/admits to her desire to try for a family. It's a involving book with a happy ending.

I would like to quote all the critics praise, just one "powerful without being didactic, moving without being sentimental, riotiusly comic without being superficial", but you can pick up the book in a bookshop and look inside the front page if you are still interested.