Quote Originally Posted by smiggels View Post
Reiteration: We want to play at the same time, one on PC, the other on PS4, but want to know if we'll be stuck on the system/reg code we originally registered our monthly sub on or if we are free to choose either platform as long as we have our own subs (which is what we're aiming for). Hope I described well enough-! =)
If you both want to play at the same time then you will each need to own both copies of the game. That means PC+PS4 on your wifes account and PS4+PC on your own account.

Each account can have a PC, PS4 and PS3 service enabled at the same time. To enable that service type you need to have bought the game for that platform and register the code to your current service.