How do I enable family sharing on Steam?

Can 2 people play games on the same Steam account at the same time?

Can multiple users play simultaneously on one Steam account? Steam does not support multiple players using one Steam account simultaneously - games associated with a Steam account are licensed for the sole use of the account holder.

Can I play 2 games at once on Steam?

Yes, you can access different Steam accounts from one computer. However, you may only access one account at a time. The accounts will share the core files for any games the accounts have in common, but each account will maintain its own custom content and configuration files.

Can you play a Steam game on multiple computers?

In general, you can install a Steam game on multiple computers (though there may be a limit to the number of computers you can authorize at one time). You just can't play the game on multiple computers at the same time.

Can you play shared Steam games offline?

If you mean with Family Share, that has been a known workaround for both playing the same library for ages. So yes, it will work. As long as you remain in offline mode you can play your games and they can play your games via Family Share at the same time.