2 steam accounts with 1 PC
2 steam accounts with 1 PC
No, unless you turn on Family Sharing and it applies only to specific titles.
Question your thoughts, it seems you might need to log in again for each account.
This seems unusual. It looks like the transactions should be connected to your logged-in account in order to access them.
Sure, you're all set. Just provide his email for verification and add him to your family sharing list. It works for me too.