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Euiyoung is Euihyun's brother right? Even though he's a child, he's his brother. And if Euihyun and Taeju got married, then Taeju's parents would be his in-law right? Not grandfathers? I don't understand this part. For it to be a grandchild, it should be their child and Euiyoung is his brother. Usually, in my culture, it's like that. Or is it because he's a child that they call themselves grandparents, because that would make a little bit of sense