Originally Posted by
worldofneil
Sorry, but no. You can only login with ONE character per service account at a time (regardless of whether you use PC or PS4 etc).
The only way you could both play at the same time would be to have two different service accounts (so you would then need at least two copies of the game and you'd also have two monthly subscriptions) and you would need each character to be on a different service account.
Sadly you can't move characters from one service account to another so even if you were happy buying another copy of the game for a new service account as well as paying a 2nd subscription, one of you would have to start over with a new character.
Sorry that I don't have better news!