@★al★ they haven't declared themselves as siblings yet? Sister/brother is a common way of addressing in China (like how in Korean Unnie/Oppa) so unless they reveal that they're actually siblings which is disgusting , probably don't make assumptions
Comment by yurioverall on ★al★
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@yurioverall I ain't Chinese or Korean so I had no idea and was freaking out when I saw the word sister so thank you so for explaining 😭