Maggie Tobin, Liz Carstensen, Dennis Holowitz
As far as what the key passage is, I'm not sure what you are asking. There are several key passages in the story. It could be after Liz gets an illegal abortion and what results from that. It could be the relationship between the kids and parents. I'll refer you to the enotes link below, or if you have a more specific question, I'll be glad to try and help you.