I'm aware of how the patch works because of its size. It's not a script but a switch. If you actually read the dialogue at the very beginning you would quickly realize patch.rpy is only applying to the old scenes. Otherwise the mom and sisters wouldn't reference real estate jargon to you in all the newly written lines in the old scenes.
This is further backed up by
Onyxdime strongly hinting that there would be a "real" incest patch that would go beyond just rearranging the names, as well as Celia's original route being restored by the next patch that would supposedly fix all the bugs. I have been of the opinion that it makes no sense to withhold the patch until the fixed version "so there's no bugs" when the whole point is to test everything in this phase.
But yes, you, who have simply restated how these patches work twelve times and not a lick of what I have said has gone through that tiny brains of yours is still an idiot.
Show me the opening dialogue with Caroline and if there's an absence of the MC mentioning her advising "Linda" to help MC move in then you have an incest patch that I don't have, although that would make no sense as you all would need is a patch.rpy.