Final answer:
Families have unique and idiosyncratic rules contributing to their structure and dynamics. The definition of a family has expanded to include various forms of connections and relationships beyond traditional blood or legal ties. These family constructs serve emotional and economic roles in society.
Step-by-step explanation:
Families have unique and idiosyncratic rules which can be overt or covert and are partly responsible for determining the nature of the couple or family. The sociological understanding of what constitutes a family includes various configurations and connections among people who may be joined by blood, marriage, cohabitation, or adoption. The concept of family in society has evolved and become more diverse, where traditional structural definitions have been challenged and complemented by views that focus on the relational aspects and the various roles that family members play. Understanding families involves examining the emotional connection, the economic unit it forms in society, and how sociologists and anthropologists categorize different types of families and household compositions.