I am trying to find an almost certainly dead relative that emigrated from Spain to Cuba before finally moving to USA.
I have in my hands the complete name with Spanish conventions (name + 2 surnames) and will have the birth date in Spain (around 1920s).
I have a parallel investigation to get information about the emigration to Cuba and later on to USA.
What I am trying to do is to find details about this person, specially descendents and potential relatives. How can I achieve this without direct contact with the person?