That was what I thought too. Until at some point Kylee at the party say, we are cou...
i'm trying to fix things via script. At the moment it works. But I have a vague feeling that it's built into the script in multiple places that they're kind of like cousins, aunts, uncles, and so on. Unless the developer forgot to change these things, when he gave the choice to the players to decide, the type of relationship. Also because I remember that in the beginning there was an incest patch to change the relationships in the game. Patch that was later removed, given that after many requests the developer decided to insert the relationship selection screen. At least that's how I remember, maybe I remember wrong.
Anyway till there is an open script and the thing to correct is my with our o change cousin with sibling. Its easy to change
Hope that is the only things to do for a small part. Otherwise i need to restart and change the relationship to the correct order.
Edit #1
Unfortunately you cannot play by inserting mom, sister and dad. There are quite explicit texts, where the alleged father says to the MC, you are the last thing my brother left me, I love you like a real son. So it's not possible, except with an hard rewrite. And I'm not so good at it
I don't know what to come up with (during me correction in the script). I had to restart the game and change relationships back into the game. Too bad you can't choose the type of relationship. Hope the developer make some sort of patch, or rewrite better the plot at the start. Because or you do a blood related aunt, or not.