HELP! PSN questions...

[Niwashi]

Ah, I see, at least partially. That lets you use multiple SE service accounts (under the same parent SE account apparently) on the same PSN account. But if your family have separate PSN accounts anyway, I still don't understand why they'd want to use yours and you'd want to move to a different one.

Separate service accounts still require separate game purchases and separate subscription fees. Being under the same overall SE account just provides a common login to the MogStation to manage all of them. If you want that, I'm pretty sure you can set up the service accounts on the MogStation itself. Then when you buy the additional copies of the game, register them on your family's PSN accounts, just link them to the newly set up service accounts.

(I haven't actually tried doing that, though. I have both a PSN master account and sub-account, and both have FFXIV, but they're linked to entirely separate SE accounts rather than separate service accounts under a common overall SE account.)


EDIT:

I will make a picture... I have:

PSN 1 > SE 1 > Account 1

I want to know that with this add on can I make:

PSN 2 > SE 1 > Account 2

It sounds (from the description) more like this is so that you can have both:
PSN 1 > SE 1 > service account 1
PSN 1 > SE 1 > service account 2

If you're looking at PSN 2, you wouldn't need an add-on, just another regular purchase of the game. But on a PSN account where you've already bought the game, it doesn't allow you to buy it again, so they list what's essentially another game purchase as an add-on (for people who want to play multiple accounts).

Then swap them:

No, it's not possible to swap SE accounts between different PSN accounts. Once linked, they're permanently linked.