Italian citizenship by descent (iure sanguinis) can only be recognized to those who personally request it.
This acknowledgment is subject to the proof, by the person concerned, of a direct blood relationship with an Italian ancestor (avo).
As long as their descendants in a direct line to the applicant have retained the right to Italian citizenship without interruption.
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Requirements to obtain Italian citizenship if you are a descendant
To start this process you need:
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Requirements and documentation to apply for Italian citizenship
If a foreign-born ancestor applies for recognition of Italian citizenship for himself, he must also provide his own documentation as an applicant.
Necessary documentation about Italian-born ancestor
Source: Eluniverso

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