In China, Don is his father's relative and Biao is his mother's relative.

In Korean, there is no difference in appearance.

it should be

But I'm not sure if people say that explicitly. Because if it was mom's biological brother and sister, would you say it? . I once asked, Koreans say that my brother and sister are, or rather, he is my (cousin).

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?

Although it also means brothers and sisters, it doesn't seem to be used much now.

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Is a four-inch sister, (four inches) refers to the relationship with uncle's generation of children.

? It's my cousin's sister.