Can I play somehow with my bro minecraft with one account?

Before I buy minecraft can me and my brother play minecraft together just us two in an offline server or through ethernet cable or somehow? :/

Added (1). latest minecraft

Nope, sorry. You've gotta have two or more accounts to play multiplayer.

Buy an account for your little brother and then you can play through LAN.

You need LAN with another PC. But you still need to make your own server and make it LAN. Otherwise no.