Originally it was only the father.
Equal protection made it one or the other or both.
It was vattel that confused this by using the term “parents” then contradicting himself in the same paragraph.
We don’t need vattel...the answer is in common sense.
Have a nice day
originally, it was the soil.
Right, but logically it has to be both not one or the other because otherwise the purpose of avoiding divided loyalty would be defeated.