I always hope that the twists and turns will simplify and not complicate an already tangled situation
for example, we may find that MC's mother participated in a gang bang with all the fathers of all known female characters.
then she found out she was pregnant without knowing who the father might be.
after the birth she made the decision to operate and become a man to give her son a male model, since it was already evident that MC was enough chick.
this would explain why the mother's family does not want to deal with Neil, is an old-fashioned family and they do not accept this transition, and would also explain the question of the letter that MC must read, with the father / mother confession.
in practice then each chapter will exclude a possible incest