Was my grandfather, who was born in Brazil, actually a Portuguese citizen?

This might sound odd, but hear me out.

My great-grandparents were born in Portugal. They came to Brazil in 1894 and 1898, and had two sons in 1899 and 1903. They subsequently returned to Portugal for a brief period, before returning to Brazil in 1904.

My grandfather was that son born in Brazil in 1903. His name was Miguel. I recently found the ship manifest traveling from Lisbon to Rio de Janeiro with him traveling on it. Here is his entry:

He is only 18 months old, but if you’ll notice here it actually lists his nationality as Portuguese. Despite being Brazilian-born and carrying a Brazilian passport until he died in the United States, does this technically make him, in a roundabout way, a Portuguese citizen? Because that would be enormous news for my family. Two of my uncles have since moved back to Portugal, living in Faro, and are in the process of acquiring Portuguese citizenship. This would make their application immensely easier, as well as qualify their children for it too.

Does anyone have any insight into how citizenship would have been transferred in those days? Would it have been granted to Miguel as soon as he entered Portugal, considering he was the son of two Portuguese nationals? What weight does this ship manifest listing his nationality as Portuguese have as documentation of his actual status as a Portuguese citizen? Does it matter at all that he was only a baby?

I’d really appreciate any insight you all might have. 🙂

submitted by /u/NubaMountains
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