This subject is always weird with what people are and aren’t okay with
It’s inpkoed that Effie and the sister have had or maybe even still have multiple sex partners. Are people okay with that?
Even though the mom is fucking you it can probably still be assumed that She still had sex with him sometimes considering how aggressive he is, are we okay with that?
I don't have problems with Effie and sis having fun with other partners. I like, like probably everyone else in this site, the idea of every woman being only for the MC, but it's not unfair if that doesn't happen, if the MC is fucking everyone then why one girl should have to be tied to only one guy? It's not vanilla but it isn't that bad or rare, for me at least
Now, I'm big mom-son fan, even with that I wouldn't have problems if the wife fucks with the husband, because they still are wife and husband after all, I love the "my son is my only man in my life idea" when it happens but it just doesn't happens here wich is ok too, it's not like they aren't togheter, they still has to live in the same house and sleep on the same bed, like in most mom-son story.
Now, with that being said, my only problem with the father fucking the mother is that it doesn't seems to be consensual because how aggressive he is like you mentioned, if it was consesual I wouldn't have any problems, but I doesn't seems like it always is. Also, the father is the most hatefull person I've ever seem in this type of games (like seriously, please someone recommend me a mom-son game with a father as shit as this one or worst) and I want the worst for him, but he is designed to be like that. My theory is that someday we will have an update about the father and we will know why he is like that, but until that point I kinda dislike the idea of they fucking for that reason and is for that reason that I consider that the mother story isn't finished yet