Violence between children, including between siblings, is considered as a separate form of family (domestic) violence. The problematic nature of this illegal phenomenon is substantiated based on analysis and generalization of the results of scientific research by Russian and foreign scientists, including sociological and other data obtained by them. The aim of the work is to study and determine the degree of public and scientific recognition of the problem of violence between siblings in principal in legal and other aspects, to consider the existence of a basis according to which it is possible to identify it as a separate form of family (domestic) violence in order to improve the organization of the activities of crime prevention bodies. The Author applied a dialectical approach to the scientific cognition of social relations associated with the commission of acts of violence between siblings, the method of analysis and generalization of the results of scientific research. The results of the study were the confirmation of the hypothesis about the existence of the facts of committing violence between siblings abroad and in Russia and the demanded need to recognize it as a separate form of domestic violence, as well as the suggestion of an expanded understanding of the object of state-legal protection of individual rights from domestic (family) violence depending on the type of persons attempting to commit it. Not only parents (cohabitants) and other legal representatives of minors act as subjects of family and domestic relations, but also older children who commit acts of violence against younger brothers and sisters. The proposed understanding of the object of administrative and other offences committed in the sphere of family and domestic relations will allow the bodies of law violation prevention to improve the organization of their own activities in the field of protection of the rights and legitimate interests of minors.