By analyzing the hereditary law, we can see that it is fully tailored to ownership. Simply put, the inheritance system is intended for translation of ownership relationships between certain subjects whose relationship with the testator is most often based on major social relationships. The bond between the testator and the subject may be blood relation, marriage or extramarital relationship, and adoption. The right to inherit is also guaranteed by the Constitution of the Republic of Croatia. This paper defines the basic concepts of the Inheritance Act (successor, recorder, estate, and so on). The intention was to establish the basic principles of hereditary rights and to provide a more detailed insight into ways that can result in legitimate inheritance. Particular attention is dedicated to the principles of legal succession.The law as the legal basis of inheritance distinguishes several succession orders. A distinction can only be observed with a special emphasis on the foundation of inheritance and on the degree of succession (first, second, third and fourth order). The computation of blood kinship is specified by assertions as well as by schematic descriptions.