Why does chinua achebe tell us the story of how chike's parents were married in the middle of chike's school days?

In the middle of the story, Chinua Achebe relates the circumstances surrounding the marriage of Chike's parents in order to provide us some sort of context for Chike's seemingly strange habits.

Accordingly, Chike and his family live in a traditional Nigerian village where children are regarded 'as the common responsibility of all.' One day, thinking to do him a kindness, a neighbor lady offers Chike, then four years old, a piece of yam. 

i dont know what you want me to answer

a compare and contrast essay is a piece of formal writing in which the author focus on the similarities between two ideas, objects, places, etc., and the differences between them. there are some aspects that the author should take into account when he/she is crafting the essay. first, the author has a clear idea of the effect that he/she wants to produce on the audience (a purpose). his/her main idea should be presented in the thesis statement in a simple but effective way which gives the audience a clear idea of the content and the direction of the essay. in addition, it is also important to focus to the similarities and differences that not only are interesting and relevant to the reader but also provide a new, impressive point of view or deeper understanding of a topic.