(あに)

あに
noun
older brother (humble)
1. older brother (my older brother)
Humble term used when referring to one's own older brother when speaking to others outside the family.
My older brother is a university student.
My older brother lives in Tokyo.
My older brother is 3 years older.
My older brother is married and has two children.
My older brother wants to become a doctor, so he studies late every day.

(あに) is the humble term for one's own older brother, used when speaking to people outside the family.

FAMILY TERM SYSTEM:

USAGE NOTES:
Within the family, children often call their older brother (にい)ちゃん or by name. (あに) is specifically for describing your brother to others.

RELATED FAMILY TERMS:

The pattern is consistent: plain forms for your own family, お〜さん for others' or polite address.