兄 (Kanji for older brother)

STRONG for KYOU.

Onyomi

KYOU / KEI

as in "KYOU (今日) my older brother acted OK. Tomorrow he'll be a bully again. "

My older brother is eating so much, he is basically a mouth on legs.

( お ) にい ( さん )	older brother (used about ANYONE's older brother, or even ANY guy that strikes you as being of an 'older brother' age, almost like you could substitute niisan for 'dude') ★★★★☆
あに	older brother (used about YOUR own personal brother) ★★☆☆☆

兄弟(きょうだい)

siblings ★★★★★
兄 (older brother) + 弟 (younger brother) = 兄弟 (siblings)

siblings (not just brothers)