The childrens to school every day

In marigolds, what does lizabeth’s parents interaction in the middle of the night mainly reveal about lizabeth’s father?

What is the reasoning in this argument?

He had fished in the river since ten years and he was a good fisherman. he know where to found the slim sliver chilwa fish, a big beautiful mahseer and the long moustache singhara. he know where the river was deep but where it is shallow; he knew which baits to use - which fish like worms and which liked gram. edit the above