Has anyone received Portuguese citizenship from grandparents or futher being born in former Portuguese territories?

Hello,

Sorry for the dumb question, but I was wondering this. If my great great grandfather who was born on 14 February 1882 in Sao Nicolau, Cape Verde Islands, Portugal(I know this isn't in Portugal just copying and pasting what I see on his file). Would it something like that would be possible to claim Portuguese citizenship. Both my Grandfather and Father are alive I'm assuming the process would have to be started through them before I could claim? Though this one is a huge long shot and I do have a Brasilian citizenship by origin as well. So the 2 year Spain route might be easier.