The participation in events and situations gives the people in this unit a bond that they share with no other. They experience each others action and reaction to the many circumstances of each day. As these experiences accumulate they become a reservoir of identity that gives the individual an understanding of self and a sense of character and purpose in the context of the family unit. Common interests is a result of the shared experiences that these folks have known. There develops a pattern of concern that may or may not be spoken that works to give life or to sustain it for the participants in the family unit.
Common goals are essential to the development and endurance of family.
The family exists to do something. Those acts and goals are changing and not always fully defined, but they are real and essential parts of sustaining family. Common order is another component of family. This gathering has learned the system of relating to each other. They may not have written those customs down, but everyone in the family comes to understand the design of the system that they live in.