おにいさん
older brother
The big brother with the polite wrapping put back on. The same Annie にい as 兄, addressed properly this time. How old is yours: おにいさん.
兄 あに is your own older brother when you talk about him. お兄さん is what you call him, and anybody else's.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.