He didn't sleep with the father. In one of the past chapters, Eugene revealed that the one he actually slept with was Winston, but he doesn't remember because I think he was drugged or in rut or both. I don't remember clearly, but yes, the child is Winston's, and that's why Eugene has been trying to hide the fact of it, because then the will would automatically be fulfilled, and he doesn't want that.
As for why the father was good to Eugene, it hasn't been revealed, but based on Eugene's memories, he was a good man without any indecent or vulgar behavior towards him. (It was the mother and the other family members who have been feeding those ideas to Winston because they don't like Eugene at all.)
As for why the father was good to Eugene, it hasn't been revealed, but based on Eugene's memories, he was a good man without any indecent or vulgar behavior towards him. (It was the mother and the other family members who have been feeding those ideas to Winston because they don't like Eugene at all.)
Not a single day without wanting BIG BOOBAS (all hail to all the fictional daddies)