I was very impressed with the skilful use of an unreliable narrator. The son clearly loves his father and in the case of the fixed race, is completely unaware that there has been a scam in process. It is this genuine childish innocence which makes for such a moving story and allows us to see the father sympathetically.
I felt that the conversation at the end with its brutal assessment of the father by his contemporaries is a very powerful conclusion as it is the first time the corruption of the world directly impinges on the child's vision.
The Heart's a Heavy Burden--Howl's Moving Castle
"Time and Relative Dimension in Space"