I don't know if it's already discussed before, but is the Patch official? i mean i don't see the incest tag on SS official site and lately some game revealed that the dev doesn't even intended for a taboo stories and it will messed up the game should the patch is applied.
Not the dev or the person who the patch, but I am someone who was active in the community a couple years ago (holy fuck, this shit's over 4 years old). The original handful of builds had Debbie and whatever the sister's name is as actual family members. Hell, the mom used to look exactly like MC with tits. The reason why he changed it was because Kickstarter started enforcing a policy against incestual content, and seeing how Dark Cookie gets fuckin mad stacks from Kicksrtarter monthly he really didn't want to lose the support from that site. He just thought it'd be easier to change the story than to move to a different crowd-funding site. Which, to be honest, was a smarter choice financially speaking.
I could be wrong, but I think the patch was done by the devs he hired during that transition. It just was never "official" to make sure Kickstarter couldn't get on his ass for going against guidelines. I personally wouldn't use the patch because it makes such a minuscule difference narrative-wise, and would at least wait for the hot-fix for this update.