What is Catherine thinking (spoiler)
at the end? I'm assuming she's wondering if Ryan will turn out to be a psychopath like his dad, and inherited his dad's genes--but what has Ryan done to make her think that? He seems like a nice kid. He's not perfect but does he actually display signs of being a Bad Seed?
Or: could it be... Catherine's daughter Becky had Catherine's EX-HUSBAND'S kid? I know, pretty soap opera-ish. But notice the ex had nothing to do with the boy. Anyway, I still don't really buy the explanation why Becky killed herself. I think there's more to it.