Yea, as an RPGmaker Developer myself, I knew/know where to look, I'm just saying this time around...
It'll be so much more work, that I'm not WILLING to do, maybe I should have been more clear lol
Basically the old ones had config.set files, that if I had to guess, were put in place for a quicker mod, and NLT must have foreseen, if not even intended for this to be quick-patched by the community.
Regardless; the issue now is you'd have to manually go in and change every instance of the name "Heather" or Chloe to their respective role as Mother or Sister, whereas before there was an indexing agent in place to quickly change every instance at once. Not sure why the shift this time around, but there's a reason no one has been able to simply "Incest Patch" this properly so far. I'd be more than happy to be proven wrong and someone comes along with the answer, and it was just "somewhere else" or an alternate method exists... but even then, my Mod will still work as a companion to it.