wow we definitely need to speak with the dad. I feel like there's so many ways you can take this. who is Nat's 'donor'? How did Andrew die? Why doesn't papa like dad? These questions need answers! I love your game its really cool!
I assume Nat's donor is literally a sperm donor, possibly anonymous or just not in the picture by design. It seems like Andrew died by suicide. It also seems Papa was just always going to be hard on whoever his son in law ended up being. Dad didn't ask his permission to marry mom which seemed to bother him. I don't think it's meant to be a severe hatred or anything, just a general dislike which still sucks of course.