弟 妹 dì mèi : sister in law (wife's side); younger brother and younger sister

姐 jiě : older sister

Big5: , Unicode: 59d0 (姐),
Links: MT, Cantonese, Ld, Chinese Language

姐 姐 jiě jie : older sister

姐 妹 jiě mèi : sisters

老 二 lǎo èr : the second child or brother (or sister)

妹 mèi : younger sister

Big5: , Unicode: 59b9 (妹),
Links: MT, Cantonese, Ld, Chinese Language

妹 妹 mèi mei : younger sister

嫂 嫂 sǎo sao : sister in law (husband's side)

甥 女 shēng nǚ : niece (sister's daughter)

媧 [娲] wā : (surname); sister of Fu2 Xi1

Big5: , Unicode: 5aa7 (媧),
Links: MT, Cantonese, Ld, Chinese Language

嬃 «媭» xū : elder sister

Big5: , Unicode: 5b03 (嬃),
Links: MT, Cantonese, Ld, Chinese Language

姨 yí : one's mother's sister; aunt

Big5: , Unicode: 59e8 (姨),
Links: MT, Cantonese, Ld, Chinese Language

姊 «姉» zǐ : older sister

Big5: , Unicode: 59ca (姊),
Links: MT, Cantonese, Ld, Chinese Language

姊 妹 zǐ mèi : (older and younger) sisters

姊 姊 zǐ zǐ : older sister