姐姐If you want to write, In passed rule 姊姊→Have a bloid relationship with you 姐姐→Have not blood relation with you However, this rule is not commonly used. Now, 姐姐 and 姊姊 are usually same in writing. But, if you want to describe a woman that not know her well or just familiar with her, use 姐姐 or 小姐 (xiǎo-jiě) (if yoy write 小姊,we can understand, but it will ...