AI Personhood

Saudi Arabia has granted a robot citizenship and Europe is considering personhood for AIs. In order to define personhood don’t we have to first define intelligence, consciousness, life, and sentience? I think it will be hard to get agreement on those definitions. (I think I am OK with Clark’s definition of sentience. See A Theory of Sentience, OUP, 2000) I wouldn’t want these quantities to be assessed using scalar measures. I also worry that our measures will end up excluding some humans. And would AIs be credited with free will?