First let’s make a distinction between the two. Citizenship is a right granted to descendants of Italians, born or not in Italy. It is possible to have more than two citizenships. Naturalization, on the other hand, is granted by the Italian government to those who express their desire to acquire it – for example, through marriage. In this case, the original citizenship, such as the Brazilian one, is often lost.
If there are only men in your line of descent, the process of applying for citizenship becomes easier. Every Italian man automatically gives Italian citizenship to his children – even if they were born in another country. If you had an Italian great-grandfather, great-grandfather or grandfather, you may be entitled to the advantages of having Italian citizenship.
If you have an Italian grandmother or great-grandmother, for example, your descendants will be entitled if her children were born after January 1, 1948.
Anyone who is married to an Italian citizen can apply for naturalization as long as they live together in Italy legally for at least two years. Or that the marriage is at least three years old – in this case, whether they live in Italy or in another country. If the couple has children, the request time is halved. Unlike Brazil, stable union is not yet recognized in this process.
It is also possible to become an Italian citizen by residence. It applies to people who have been living in Italy legally for at least 4 years (if you are a citizen of another EU country) or 10 years (foreigners outside the European Union). In the process, the person loses his other naturalness. That is, in other words, it will no longer be Brazilian. The process takes place at the municipality of your Comune in Italy and lasts for about 2 years.