Any time you have a story from different points of view, it is in order for the reader to read all aspects and gleen the truth from the whole. For instance, if twenty people see a car accident, none of those twenty will tell the story exactly alike, but the officer who interviews the witnesses will be able to take the elements that are the same or similar from every witness and safely determine, "This is the truth."
From the sisters' point of view, we need to consider who the sisters are:
Rachel: Self-centered, self-proclaimed "Queen". Platinum blonde hair, selfish and unable or unwilling to recognize the depth of suffering which surrounds her. She notices only her own problems.
Leah: Adah's twin. She is not deformed and often leaves her sister behind. She is a daddy's girl and basically worships his every word in the hope that he will recognize the effort.
Adah: Leah's twin, brilliant, but born with a physical deformity. Chooses not to talk out loud, but her brain is always working. She is observant, able to pick up languages very quickly, and writes backwards so her thoughts will remain private. She feels accepted in the Congo because everyone there has something wrong with him or her, and she is rarely stared at for her deformity...but because she is white.
Ruth May: The youngest. Stubborn, energetic, and always looking for a new adventure. She is open-minded.
Reading an event from their views, one will see the truth!