There are two words for older brother, and they are used in different contexts.
When talking to someone else and you refer to your older brother, you use a humble form. You would say "ani" (hiragana: あに kanji: 兄).
When talking to someone else and you want to refer to their older brother, you use a polite form. You would say "onii-san" (hiragana: おにいさん kanji: お兄さん). You also use this word when talking to your older brother. So if I had an older brother I would call him "onii-san" or "onii-chan".
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SaSuKeLoVr2000's answer b-low
i think it's nii-san or nii-chan and for elder brother it's onii-chan
兄 (ani) is older brother in Japanese. When addressing someone else's older brother, you should use お兄さん (onii-san).
Nii-chan or Nii- nii is Japanese for older brother. Onii-chan is someone else's older brother.
Nii-chan means "older brother" in Japanese.
The Japanese word for sister depends on what type of sister you're talking about. Older sister=onee Younger sister=imouto Slang for older sister=aneki Anyways...hope it helped. =P
Onee- Older sister (most common, though there is one more)