I have Family-Shared Factorio (base) with my wife (she's in my Steam-Family).
I would like to Family-Share Space Age as well. Our intent is to join a friend's multiplayer server together (each on our own computer).
Is this possible?
If so, can someone please provide a step-by-step? I'm reasonably technical (retired software engineer), but the UI -- esp for Steam -- is a bit obscure (or maybe I am obtuse!

Thanks!
~Ted/Chumette
EDIT:
My question is about what is permissible in Wube's eyes. I am absolutely NOT asking how to hack around things and "get away with it".
EDIT:
Image of a bit of Steam-UI that makes me think it's in my shared library and my wife can get it, but she's only offered to "add to cart":