I have had Stadia for about ten days. And it's a great experience, but I have an important question for the well-being of the family. Can you tell me, when can we have more than one game / save game? So that my children and my wife can also enjoy the games I play.
The answer in short is that we don't know yet. Family Sharing is a feature that we are expecting to see at some point in 2020, but it hasn't been confirmed when exactly yet.