Sociology studies social life, human groups and society. Culture is one the most widely used terms in sociology. Culture refers to the way of life of an individual within the society or social groups. Society is a system of mutual relationships which connects individuals. Family is one of the longest-lived institutions. A family is a group of people directly connected by family relations, where adult members assume responsibility for child care. Traditional understanding of the term family refers to heterosexual married couples and children, and in distant past it refers to cohabitation of more generations under the same roof. As family has been changing throughout history, it has become the focus of study of different scientific fields, which have different approaches to it. Modern family is faced with numerous changes as a consequence of globalisation and more and more emphasised liberal aspirations, which impose new values and new ways of understanding of interpersonal relations. Beside the term traditional family, the term modern family also occurs, which imposes the request for freedom in all areas of life. The traditional family institution has been experiencing a period of crisis, which can be observed in the increase in the divorce rates, decline in the birth rates, increase in the number of single parents and increase in entering into second marriage. Threats to the modern family are polygamy and divorce trend. In the last few years, referendums on the question of defining a family have been held worldwide. New models of family have been formed, such as common-law marriage, single-parent household and same-sex life partnership. Those models are mostly manifested in Europe and America, and try to replace the function of a traditional family in the society.