The article researches the etymology of the term «family». In particular, the content of this concept as a social phenomenon is given, as well as an analysis of the opinions of modern Ukrainian lawyers regarding its legal content, and as a result, a proper definition of the legal category «family» - a set of persons, relations between which are based on mutual rights and obligations - is proposed languages, cohabitation and everyday life, arising on the basis of marriage (marital relations without marriage registration) or consanguineous ties, or other forms of adoption of children for upbringing, and which bear mutual responsibility for non-fulfillment or improper fulfillment of family obligations. It was established that there is no single approach to understanding the definition of «family» among scientists, just as there is no single comprehensive concept in the legal system of our country. In addition, it is noted that there are two opposing positions in the legal literature regarding the need to form a single definition of the term «family», because some scientists support the position of legislating the category «family», explaining this by the fact that different branches of law regulate different in terms of content, legal relations with the participation of family members, others, in turn, do not consider it necessary to enshrine the term «family» at the legislative level, because the criteria characterizing a family are very multifaceted and diverse. The characterization of the subjects (participants) of family legal relations provided for by the legislation of Ukraine, taking into account a certain sequence, was carried out. In particular, three groups of participants in family legal relations are distinguished. The first group is spouses, parents, children and the adoption institute. The second group is grandmothers, grandfathers, great-grandmothers, great-grandfathers, grandchildren, great-grandchildren, siblings, stepmother, stepfather, stepdaughter and stepson. The third group is other family members provided for in Chapters 19 and 20 of the Family Code of Ukraine.