The aim of this paper is to analyze the provisions of the Croatian Family Law which regulate the procedures for determining the origin of a child, with special emphasis on the origin of the child from the father for the purpose of protecting the child's rights from the Convention on the Rights of the Child - the right to know one's origin. The family is the fundamental social community, and the assumption of family life is the origin of the child from it. In order for the child's emotional and psychological development to be complete and for him to enjoy the mutual rights and obligations that belong to him from the family status, it is necessary to establish that he originates from a certain father and mother. In this sense, the paper analyzes the rights of the child guaranteed by The Convention on the Rights of the Child and The Convention on Human Rights, which form part of the internal legal order of the Republic of Croatia. The presumption of motherhood and paternity, the institution of recognition of paternity, and the establishment of paternity in court proceedings are thoroughly elaborated with the analysis of two cases from the judicial practice of the European Court of Human Rights. The paper highlights the peculiarities of court proceedings in maternity and paternity disputes in relation to regular civil litigation. Certain problems of the provisions of the Family Law governing the issue of the child's origin and why and how legal certainty is called into question are also elaborated. The study of scientific and professional literature, domestic and international sources on the described topic gave rise to concluding thoughts, which are contained in the conclusion of the paper."