I wanted to be able to acquire a ps plus abo i and my sister can i use it without any restrictions? Have 2 accounts on the ps4?
Yes, that works, if the "acquiring account" is activated as the primary account on this console.
You need to sign up for the PS4 with your account as the primary Playstation then your sister's account can use the PS Plus games as well as any other titles you have installed and the online multiplayer on their account.
But what they have no access then are features like the Savefile cloud is not so tragic but you ask for unrestricted use and quite unrestricted it is not.
Think the most important thing is that you can access the games with your PS Plus and play online as long as the Playstation is primarily logged in with your account.
