Quote 7
Ann: Haven't they stopped talking about Dad?
Chris: Nobody talks about him any more.
Keller: Gone and forgotten, kid. (1.430-432)
Just as they team up to protect Kate from the reality of Larry's death, Joe and Chris keep the truth from Ann. In fact, the neighbors talk about it all the time.
Quote 8
Ann: I'm not here out of a blue sky, Chris. I turned my back on my father, if there's anything wrong here now… (2.119)
Ann places principles over family and she expects Chris to, as well.
Quote 9
Ann: I wish we could tell her now. I can't stand scheming. My stomach gets hard.
Chris: It's not scheming, we'll just get her in a better mood. (2.25)
Chris is afraid of his mother's reaction and keeps making excuses to avoid telling her about the engagement.