I have a Steam account. For example, on this I have LS 19. If there was no Corona, a friend would come to me now, for example. And I'd love to play this with him on a laptop. I play on my standard PC and rather on my laptop via Team Family, I can share the game. But can I also play with him in multiplayer? I tried this and then my friend says he wants to return this game. But we don't want that.
You can't let others play a game via Steam Family and play it yourself, whether separately or together.
I mean it's not even possible for someone to play one game of yours and you play another game of yours, but that might depend on the game he or you are playing.
Apart from the fact that it is called "Family Sharing" and not "Friends Sharing", and you are violating the terms and conditions, you can't play one and the same game at the same time anyway, which is why the question does not arise with the online.
Because if someone plays a game from your shared library and you start any game in your library, then the other person will be automatically kicked out of the game.
If you both buy the game, you can both sit comfortably at home and play together…