I mean, I have played "Corruption Time" and there is a duo father-son, with beautiful mother, and 3 beautiful daughters. And I didn't mind son's present, who wasn't protag but fucked as 1st in this VN, and I didn't felt any jealousy, nor hate. And no, in real life I'm 99% sure that I would not share my girl/wife. But in game? If it is consensual, and there is a good person to share it with, why not? I can kind of understand you, and I'm definitely accepting your pov. You are you, and I'm me, we can different view on this thing, it's ok.
So you are saying that this game is about love, and love is about forgiving, love can win those years of neglecting. I can't recall that MC, or anyone in his family was saying that they hate father, yes, that have told that MC where arguing with father, and father was arguing with son, but, even I argue with my mom, even few times per week, but that doesn't mean that we hate each other, or don't love. Arguing is normal. there wasn't any abusing, or anything like that, so he wasn't evil person, or terrible dad, he was more like "not good dad and husband".
About Alica and father sex, she was saying that they have sex life, but it was more robotic, without emotions, more like "I wanna cum, let's fuck", she was saying that that good she wasn't feel for years. Like I said, father can have good reasons to close himself from family, or he is just a dick, We don't know it yet. I accept that you don't want him, that a lot of people here don't want him, typical cliche harem is good, even for me, but sometimes is just boring, it's too much game like this. I will accept whatever dev will decide, and like I said before, I trust it will be good.