The issue of nationality is one of the basic topics in the life of states, and in its legal fabric it is considered one of the dangerous tools by which the personal scope of state sovereignty is determined. It also regulates one of the formative pillars of the state, which is the people’s pillar, and it is without a doubt one of the most important pillars of the establishment of the state at all. There is no value or importance to the corner of the territory without a people who populate it and develop it, and there is no ruling authority without the presence of the people who are addressed by the legal rules and orders that that authority sets. The latter is an element of the people’s corner of the state, and from here comes the important and effective role of the rules of nationality law to control all of that. The natural person is the original addressee of the provisions of nationality, whether male or female, as long as he carries within him a spirit and a feeling of belonging to the territory of a particular state, and that respecting the will of the individual within the scope of nationality, given that the matter relates to one of his fundamental rights, has not been devisable from statutory legislation, whether regarding Acquiring or changing nationality. Also, respecting the will of the natural individual (the human being) in the field of nationality does not raise a problem, but the problem arises when the human being is a composite of two personalities, which applies to (conjoined twins) if it is confirmed that they are more than one person in some cases, his right to obtain nationality Originality by birth, and if one of these twins wants to acquire a new nationality or wants to change his nationality without the will of the other conjoined twin, what is the ruling on this acquisition and the change that occurs with regard to the other conjoined twin who may not want this acquisition or change.