Incest is against patreon TOS that's why the dev had to remove all mentions of relations that you can find in the game. There is a patch that enables it, you can get it here: https://lewdpatcher.com/game/my-new-family , you should notice that all games that are published on patreon as well are automatically censored. The dev can not allow incest in his games that's why ther eis unofficial patches.
Hey, thanks so much for that link though. Just started the game and really couldn't get into the game because of the weird terminology that made it sound like a non native English speaker translated only those 3 words. The changes are awesome and made all the difference, so much thanks friend. Cheers.