Final answer:
Sociology focuses on the influence of social relationships on people's behavior and the development and change of societies.
Step-by-step explanation:
Sociology is the study of society and focuses on the influence of social relationships on people's behavior and how societies develop and change. Sociologists are interested in the relationship between the institution of marriage and the institution of family, as they are the most basic social units upon which society is built. They also examine social facts such as laws, morals, values, religious beliefs, customs, and cultural rules that govern social life and may contribute to changes in the family.