May I just point out how fucked up the premise is?
So you are with your father, your biological father, he remarries, at which point you, his only real family AFAWK, is like "Yeah, he's a piece of trash, let me stay with this woman, 'cause it's obviously more important to dick more pussy". It's not even that the father is presented as a cheating alcoholic, rather it's how this information is being presented.
I'm just saying, you could've chosen a number of ways to remove the father from the picture. You didn't even need to present him as a really positive figure, could've just waved your hand and said that he died in an accident or that he decided to leave one day, due to some circumstance you know nothing about. Instead, you've decided to pick this unfair, caricatural stereotype of a drinking, cheating father, then made his biological son turn on him and take his second wife's side the moment things went south like it's the most natural thing in the world.
Personally, I think it's kind of a dick move. I just wish devs would stop treating fathers like punching bags just because they need to get rid of them in order to fulfil their lust for MILFs.