Book Reports / It is not only Christopher who grows as a person. Discuss it on the basis of novel "The curious..." [3]

This is my first time using this site and I'm not a very good essay writer. I have to write an essay on the novel, The Curious Incident of the Dog in the Night-time. (I dislike the novel for many reasons but main one would be that Christopher is very prideful and annoying and it sadly reminds me of how I used to think when I was younger....)

Anyways the topic of the essay is:In 'The Curious Incident of the Dog in the Night-time,' it is not only Christopher who grows as a person. Discuss

How to start my essay paragraphs... These are my topic sentences of my paragraphs:
- Christopher doesn't show signs of change but he becomes more independent as he faces difficult challenges.
- Father grows as a person as he accepts his mistake and commits to rebuilding his relationship with his son.
- From the beginning, mother was introduced as hot-tempered who could not deal with Christopher's behaviour problems but at the end of the novel, she becomes an independent woman and learns to cope with Christopher.

Not sure if I want to keep it this way, please suggest more ideas or rephrase my paragraph topic sentences??