How is nationality of individuals determined in international law?
Nationality is determined by territory. Birth and blood. Palestinians born in Palestine are Palestinians by birth and blood. Children born of Palestinian refugees are Palestine by blood. Their parents are Palestinian nationals. We see this in the US. John McCain was born in Panama by US nationals. Ted Cruz was born in Canada by US nationals. Both are considered US nationals.
Nationality by birth alone can get political even though it is common.
LOSS OF NATIONALITY
At the initiative of the State (Article 7) 48.
Article 7 of the Convention sets out specific instances in which an individual can lose his or her nationality ex lege or at the initiative of the State. Automatic loss of citizenship is usually concerned with the voluntary acquisition of another nationality but it can also occur when an individual has been abroad and there has been no contact with the home State. Such matters are dealt with in the Convention (Articles 7.1.a and e). The other means of losing citizenship is through revocation. The Convention sets out in some detail the circumstances in which revocation should be allowed. These are: acquisition of nationality by means of fraudulent conduct, false information or concealment of any relevant fact (Article 7.1.b); voluntary service in a foreign military force (Article 7.1.c); conduct seriously prejudicial to the vital interests of the State (Article 7.1.d); where it is established during the minority of a child that the preconditions which led to the ex lege acquisition of nationality are no longer fulfilled (Article 7.1.f); and where upon adoption a child acquires a foreign nationality of one or both of the adoptive parents (Article 7.1.g). But many States have in their legislation other reasons for the deprivation of citizenship. These may include such matters as conviction for a serious criminal offence; public service without permission in a foreign State, especially if by doing so the 16 individual acquires the foreign nationality; working for a foreign intelligence or security service or military organisation; performance of acts contrary to the interests of the State; where an individual fails his or her duty of fidelity and loyalty; and attempting to forcefully change the constitutional state system. These matters were rejected by the CJ-NA in drafting the Convention and it is unlikely that extra circumstances would be accepted for adding to the Convention.
49. Article 7.2 of the Convention deals with the loss of a State’s nationality by children whose parents lose that nationality. It provides that a child should not lose the nationality if one of the parents retains it. No mention is made of whether a young person should have the right to remedy any decisions regarding his or her nationality which had been lost through decisions or actions in which he or she had no input and it should be considered whether to make a Recommendation on this matter.
COMMITTEE OF EXPERTS ON NATIONALITY - Council of Europe