Looking for Guillermo (Wilhelm) Helfers Rosack or his dad Luis (Luwin) Helfers

[mariafepua]

That's an important information. It explains why your family doesn't appear in the emigration lists (indexed in Arcinsys) though I doubt that they came from the city of Hannover (or Hamburg), but maybe from "somewhere" in the kingdom of Hannover.

Thanks, I've also found that he went by Wilhelm Helfers Rozac.