1.
older brother (my older brother)
Humble term used when referring to one's own older brother when speaking to others outside the family.
兄 is the humble term for one's own older brother, used when speaking to people outside the family.
FAMILY TERM SYSTEM:
- 兄: my older brother (humble, to outsiders)
- お兄さん: older brother (polite, someone else's or direct address)
- お兄ちゃん: big bro (casual, within family)
- 兄貴: big brother (masculine/informal)
USAGE NOTES:
Within the family, children often call their older brother お兄ちゃん or by name. 兄 is specifically for describing your brother to others.
RELATED FAMILY TERMS:
- 姉: my older sister (humble)
- 弟: my younger brother (humble)
- 妹: my younger sister (humble)
The pattern is consistent: plain forms for your own family, お〜さん for others' or polite address.