1.
older sister (my older sister)
Humble term used when referring to one's own older sister when speaking to others outside the family.
姉 is the humble term for one's own older sister, used when speaking to people outside the family.
Family term system
- 姉: my older sister (humble, to outsiders)
- お姉さん: older sister (polite, someone else's or direct address)
- お姉ちゃん: big sis (casual, direct address within family)
Usage
Within the family, children often call their older sister お姉ちゃん or by name. 姉 is specifically for describing your sister to others.
Related family terms
The pattern is consistent: plain forms for your own family members, お〜さん forms for others' family members or polite address.
Related Words
Related:
兄 (older brother (humble))
Related:
妹 (younger sister)
Keigo:
お姉さん (honorific)
Related:
弟 (my younger brother)
Related:
兄嫁 (older brother's wife)
Related:
お姉ちゃん (older sister (informal))