Chin up, if there is a will there is a way.
Maybe if you could change the mom, sis and bro etc to them using their names. And do a rewrite of the intro explaining that you are all students at a home owned by Ann. Then have a patch, that revers it back to how it's original with mom, sis etc. That might be the easiest way? I don't know. Or have it locked behind a password that the players can type inn when they are in the menu.
Maybe you should take a look at what
@a1fox3 said.
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it might be something.