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In particular, Italian citizenship is obtained based on the following:
CASES WHEN ITALIAN DUAL CITIZENSHIP IS AUTOMATICALLY ACQUIRED
The acquisition of citizenship occurs automatically in the following cases:
BY BIRTH (IUS SANGUINIS):
the sons of mothers or fathers owning Italian citizenship (including the sons born abroad from Italian citizens) are considered Italian nationals.
The acquisition of citizenship by birth in the Italian territory from non-Italian nationals is envisaged in two cases only:
BY RECOGNITION OR JUDICIAL STATEMENT OF DESCENT:
if the son of Italian citizens, recognised subsequently to his/her birth, is a minor, the acquisition of citizenship is automatic retroacts to the moment of conception. If, conversely, the recognition or the judicial statement occurs with an adult son, he/she maintains one's nationality. Still, he/she is allowed (within one year as from the recognition, the judicial statement or the acknowledgement of efficacy of the foreign measure) to chose the Italian citizenship.
any foreign minor adopted by Italian nationals acquires citizenship by right; if, conversely, the child adopted is an adult, the acquisition of the Italian citizenship is possible only upon application by the interested party five years of legal residence in Italy.
BY ACQUISITION OR REACQUISITION ON ONE OF THE PARENTS' SIDE:
minor children of parents who acquire or reacquire the Italian citizenship directly receive it provided that they steadily and effectively live with them.
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I'm Natalia Bertelli, an English/Spanish to Italian legal translator. Since 2008 I have been working on contracts, judicial deeds, certificates, corporate translations for foreign clients who want to do business in Italy, get a dual citizenship or simply settle in my beautiful country.