Yeah, your right, the dev has never said anything about the father. I'm on his patreon, discord, and communicate by PM.
It's well known that I don't like Eric, and there will be a way to get rid of him in 0.07. But it may be best to wait until later to do it. As for keeping Eric in the game permanently, I don't think that will be possible. The dev has never said one way other. We do know however that there will be family porn movies. And the dev has said that friendship with Eric will end badly for Max or Eric. A bad ending for Max = game over.
Don't be naive, Eric is only in the game to prolong Max's involvement with the girls. The longer it takes and the more spicy scenes, the more the game is enjoyable when it comes to pleasure.
Nothing more, nothing less!
Want to make a game where you turn people upside down?
More and more spicy scenes, when you get there let it hit the beam. Give him something even spicier, let someone else do the drama behind it, and then take it all away from him. And when all seems to be lost give it to him again!
Eric is only there for that + saucy scenes, more horny for things you don't have, and more attempts to get it for yourself!
And when more time and more spicy scenes more horny for things, but tries and tries to get everything for you!
Now the game's producer needs to fit these saucy scenes and directions that people want.
1- I want Eric
2- I want Eric out.
3- I want Eric as a slave
4- I want to blackmail everyone.
There are so many ways to make things happen in a way that has a lot of spicy and horny scenes at the same time!