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BROTHER.
SISTER.

Second brother's wife
二嫂
Younger brother
胞弟
兄弟
Fourth brother (younger)
四弟
Youngest brother
么弟兒
弟娃
Younger brother's wife
弟媳
Brother's son
姪兒
姪子
姪男
Brother's son's wife
姪媳
Brother's daughter
姪女
Brother's daughter's husband
姪女婿
Brother's grandson
姪孫
Brother's granddaughter
姪孫女

Sister.

Elder sister
胞姐
姐姐
Eldest sister
大姐
Second sister (elder)
二姐
Third sister (elder)
三姐
Elder sister's husband
姐丈
姐夫
Younger sister
胞妹
妹妹
Third sister (younger)
三妹
Youngest sister
么妹
Husband of younger sister
妹丈
妹夫
Sister's son
外姪
外子
Sister's daughter
外姪女
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