About the essay...well the essay propmpt is probably about what society considers "nobody's", or the segment of society who are ignored by the mainstream. If the prompt is about this issue, then here is a list of people your cousin should write about: homeless people (and the many variations of them - vagabonds, squatters, etc.), criminals (and the many different types of "criminals" - prostitutes, pimps, drug dealers), drug addicts, mentally ill people, et cetera. You can even go deeper and say that society doesn't care about poor people, black people, Native Americans, illegal aliens, whatever, just make sure to tell your cousin use facts to back up his claims.