Usages

• 表妹 : female cousin with a different surname
• 弟妹 : (informal) younger brother's wife; sister-in-law
• 妹夫 : younger sister's husband
• 姊妹 : (older and younger) sisters
• 姐妹 : sisters
• 姨妹 : wife's younger sister; sister-in-law
• 辣妹 : Spice Girls
• 幼妹 : younger sister