Cschacht1 To link your PlayStation Account to another EA Account, the other EA Account must not had been associated with another PlayStation Account before in its lifetime, (this is due to a lifetime link).
Furthermore, your Apex progress and data is tied to the EA Account it was progressed/earned on, so by unlinking the PlayStation Account, it will lose access to your Apex progress and data since it is no longer linked to your EA Account, (and by unlinking your PlayStation Account, that can also cause you to not be able to access some, (or all), of your Apex progress and data from other platform accounts, (even after relinking the PlayStation Account).
You can read more about the unlinking risks here: EA Help | How to unlink from an EA Account.
So, instead of switching your platform links around, you could have your Dad update his EA Account to use an email address under your control.
For more information on how to update an EA Account, click here: EA Help | How to update your EA Account.
