1-I don't know if you know, but in most of these games, the routes are included through advice, including through Patreon, it is normal to have a vote on what clothes the character will wear, what the next sex scene will be, and who MC/FMC will be with. Giving tips and advice is not wrong, in fact it is the most common thing in this world of 3D Porn games. Maybe you're new in that World and don't know it.
2-Just the fact that there is incest already demonstrates the character's betrayal, so bothering with NTR route with other characters is bizarre.
3-the game already demonstrates relationship status with other characters(like u can see in image below), which is very likely to be developed later, I'm asking for this to be the focus, since the relationship with the idiot child makes the story more silly and forced. You are free to disagree with me, But bothering with others just because others are giving opinions and suggestions that go against what you think is very childish of you.