We're just guessing so Miranda is Bianca's mother. Yes, I think that could be the case. But commit to it. It is a possibility and not yet a created fact.
First of all, you're wrong about the Patreon rules. Incest is not completely banned by Patreon.
"Offensive and graphic creations:
We understand that artists sometimes have to push boundaries to create thought-provoking art, so we don’t review offensive and graphic creations with strict black and white guidelines. We instead review creations in the context of the whole creator page. However, we have zero tolerance when it comes to the glorification of sexual violence which includes bestiality, rape, and child exploitation (i.e., sexualized depiction of minors). This is true for illustrated, animated, or any other type of creations. Patreon reserves the right to review and remove accounts that may violate this guideline. We also do not allow other fringe sexual fetish creations, such as incest, necrophilia, or fetish creations that are hard to distinguish from non-consensual sex. We understand that some topics on this list such as incest or rape are a little bit more complicated because these situations are, unfortunately, part of real life. As a result, when reviewing these types of creations, the Trust and Safety team will take into consideration context including personal, historical or educational narrative. For example, survivor stories or fiction such as Lolita are allowed on Patreon."
As you can read, Patreon has created a gray area where Patreon decides whether or not to show incest. Therefore your statement is wrong. So that there is no incest in BaDIK, that was the decision of DPC. Probably because he doesn't like it himself and doesn't want to go into the Patreon gray area.
If the player of BaDIK decides that the MC is not having conscious sexual activity with Jill, then there may or may not be an ending to BaDIK in which Jill and the MC could be related. Then no incest took place.
