UPDATE 2022-11-01: Updated to Chapter 13.
I used
RIC0H's Walkthrough mod as a basis for an
incest patch and applied it to the chapters 2 to 13 myself. Why? Because he wasn't finished before.
BTW: I had to rewrite a few lines. I also couldn't stand the whole "We throw 12yo boy out because he is lazy"-thing so I tried to correct that a bit. Might still be too far fetched but I think this time it's much easier to accept it and go with the flow now.
tl;dr
Here is the Incest patch AND Walkthrough mod in one file for Chapter 13