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I'm pretty sure what the author's going for with the grandfather's character is that he's suppose to be your typical patriarchal figure who's strict but fair and cares about his family very much in a traditional sort of way. The problem is that the grandfather's reacting to the family drama as if he has no idea what the hell the shit-duo has been up to despite the fact that it's practically public knowledge at this point that they're horrible people. So it comes across as either no one tells him anything and he's incapable of reading the room, or he's way too forgiving to the point of being delusional, or he's biased AF for shit-bro. None of those options make him a likable character.