What is your opinion on Christopher and his dad? What do you think the book is trying to teach us so far ? simple explanation.

The big mistake that Christopher's father makes is to hide the information from Christopher that his mother is leaving them because he wants to 'protect' his son. Presumably worrying that Christopher will feel rejected, he hides this vital information from him. Christopher's response to this, however, is not as one might expect - when he eventually finds his mother he is not angry that she left him. His relationships are conducted differently than ours.