兄 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
あに ani
KUNYOMI 訓読み
ケイ kei キョウ kyou
Examples
私の兄は技師になった。My brother became an engineer.兄がいます。I have an older brother.私の兄は健康だ。My brother is healthy.彼は私の兄です。He is my brother.私の兄は教師です。My older brother is a teacher.私の兄は技師です。My brother is an engineer.兄はいま留守です。My brother is out.トムは私の兄です。Tom is my older brother.豊には兄が二人いる。Yutaka has two elder brothers.彼は私の兄の友達だ。He’s a friend of my brother’s.