Family is a term that is difficult to define. when studying sociology it is important to remember that:

When studying sociology it is important to remember that family is the cell of society.

Explanation:

According to different Theorist and Sociologist Family is the base of the society. It is common to hear about it because is a fundamental topic to understand how society works. When an individual borns, is his family the first contact and interaction that he has. Family relationships in the first stages of life are decisve  to know how that kid will interact with others later on.  

Families are micro society in which children learns about values and coexistence. It depends on family if in the future we have good citizens ot not. That is the reason why family is the basic of the society, and so we have to ensure that our society is compose by good families.

answer; collective security;