The character dynamics in the book really shape the attitude of it. You can tell that the relationship between Ammu and Baby is tense. This changes the relationship between the twins and Baby K. Also, there is an underlying something between Ammu and Chacko. Chacko feels like he is more superior, due to him being male. Mammachi and Ammu also have a strained relationship. This is probably due to the fact that Ammu married Baba and then they divorced. Ammu is kind of the odd one out of the family. This really reflects on the children. They are sort of put into a position where their whole family doesn't like them as much as they could. This really changes how the children feel about themselves as well i think.