Answer :
Little sister - yeodongsaeng
Little brother - dongsaeng
Older sister - nunna
Older brother - oppa
Little brother - dongsaeng
Older sister - nunna
Older brother - oppa
Answer:
Little sister - yeodongsaeng
Little brother - dongsaeng
Older sister - nunna
Older brother - oppa
Explanation: Don't forget to add tone