You might want to consider looking at their stories and their roles as characters from the perspective of captivity narratives. There are some similarities in that, as they are under the power of another, they all can relate to one another on that level. As to society, this is a common theme in society - the interplay of power between the dominant figure and the dominated. There are a number of different directions you can go in, but if I were writing it I would either choose to look at them from the perspective of peripherally being captivity narratives or I would go from an entirely different angle and look at them form a Marxist critical perspective. Marxist theory revolves around the base (those who are controlled, politically the lower class) and the superstructure (the elite who are doing the controlling). The elite need to keep the base subservient otherwise they might rise against them. It is in the interest of those in power to keep those who are at the bottom of the pecking order down so that they cannot threaten their power.