Can two people play minecraft together on the same account?

Yes, but only one person can have that file on their minecraft app if the app is what you are talking about.

Assuming you mean being online at the same time, no. At least one of the accounts will be logged out.

Yes, one account can be shared by 2 people playing at the same time, but only if they are on different servers, you have to have two if you want to play on the same one together

Not online but offline yes. HOPE THIS HELPED…