First of all if you don't like incest, why do you even play a game that is fundamentally about the incest relationship between the MC and his family?
And if you still want to play the game even though it contains incest that doesn't suit you, you can always choose not to continue the relationship with MC mother (Anna) and sister (Ruby).
Also you can always support the developer on his patreon and then you will get a censored version which will not have incest until you additionally install the incest patch and since the version of the game available on f95zone which
KoGa3 used to create his walkthrough mod comes from subscribestar, it is an uncensored version and originally contains incest by default.
So it does not seem strange to you that you are the only one here asking a modder to change the game script especially for you because you do not like blood relatad incest? Because I find it rather strange because if I don't like a fetish that is in a game and it is unavoidable, I simply don't play that game and look for another one that only contains content that I personally like, rather than asking or even demanding that a dev or even a modder who makes a mod for a game changes the content in that game specifically for me.