Throughout The God of Small Things, we get to see how things look from different characters' points of view – different versions of the same reality. We see Estha and Rahel at two very different points in their lives, 23 years apart. There is a stark difference between their perspectives as 7-year-olds and as 31-year-olds. As kids, we see them learning about the world as they go; as adults, they are trying to make sense of the past.
Viewing one event from multiple perspectives helps us get at the one true story.
Viewing one event from multiple perspectives shows us that there is no single "correct" version of things.