Meaning of おにいさん in Japanese

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Definition of おにいさん

おにいさん(oniisan) 【お兄さん ·御兄さん】

(n) older brother; elder brother →Related words: 兄さん
彼のお兄さんは有名なサッカーの選手です。
His brother is a famous soccer player.
(vocative) young man; buddy; fella; laddie

ぎりのおにいさん(girinooniisan) 【義理のお兄さん】

(n) one's brother-in-law
私たちはまず、あなたの義理のお兄さんに手紙を書いて、もてなしていただいたお礼を言うべきでしょう。
The first thing we should do is write and thank your brother-in-law for his hospitality.