[duron]

I think in the us or other western country they don't have a term for that & i have ask that question with a British fren of mine.

what i noticed most Asian countries do have a term for for older or younger brother or sister, can you think of some?

cantonese, chinese
Tai lo - big brother
Sai lo - small brother

filipino, philippines
Kuya - elder bother
ate - elder sister

putonghua, chinese
jieje - elder sis
meimei - younger sis