In To Kill a Mockingbird, family is destiny. Within the confines of a small town where the same people have lived for generations, no one can escape…becoming their parents. Horror! Either the parents raise their kids to be like them, for good or ill, or the pressure of community expectations that a person live up, or down, to their family is too much to resist. While this attitude creates a comfortable familiarity and a cozy predictability, it also makes progress, both for the individual and the community, very difficult.
To Kill a Mockingbird suggests that family matters: individuals can't overcome being born into bad families.
In To Kill a Mockingbird, characters find it easier to think about people as groups rather than as individuals.