You list autism as a topic; are you exploring autism outside of the text for this topic?
Language and Communication- This becomes an issue early in the novel when Christopher is questioned by the police. The autistic are very literal, everything is black and white (the level of autism is the deciding factor here). When overly prodded to answer a question they don't understand, or that they believe has already been answered they'll shut down. When the police question him, Christopher covers his ears and puts his head on the ground (similar to a fetal position but not). This is how he calms himself, this is the body language that says he's overloaded. The opposite would be self-stimulation, a frustrated act that signals frustration (rocking, twisting hair).
Love and Relationships- Christopher's dad is a great example for your section on love and relationships. He does the best he can........... but it isn't enough. When Christopher finds his mother's letters the world changes. It's hard to generalize for you here...... most children with autism don't express their love. They don't usually hug........ they don't usually enjoy physical contact, but again, that's a generalization.
I don't know if this has helped. I've been working with autistic children for twenty years. It's a large spectrum, and each child is completely different. Certain behaviors are almost always evident, others aren't. I guess my main question for you is are all of your topics going to directly reference Christopher as their theme........