I know one dev said no NTR, and from the comments so far, it doesn't seem like there's any in this release. However, the female protagonist tag, combined with the premise of meeting in-laws and incest, indicates plenty of opportunities for the fianceé to be seduced or to seduce, either from her own family or the in-law family. For the sake of transparency, I think you guys should clearly point it out in the "developer notes section" so people who invest time in this game aren't in for a rude awakening later on. I think the lack of clarity is making a lot of people unsure, including myself. If you do have plans to add NTR, we need to know if it's optional or unavoidable, in which case many people such as myself won't play this game but you'll still have your own fanbase that knows what to expect.
Also pro-tip, if you're planning to stay on patreon, remove the incest and make it available via patch. Other, subscribestar is a better bet.