I'm 22 years old and I was born and grew up in Hungary.
A few weeks ago, I found out that my father could have acquired French citizenship (in the years before I became 18), because his mother, my grandmother was originally from France.
The problem is that I don't have any connection with my father, so it would be hard to acquire any documents from him. I think he wouldn't even share what is needed about himself, although I already have a proof of that he is my father.
Is this enough to start the process of acquiring the citizenship and am entitled to it at all?