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older brother; elder brother
brother-in-law (spouse's older brother or older sister's husband)
「兄」 has other readings with different meanings.
兄は来年から海外で働く予定だ。
My older brother plans to work overseas starting next year.
子どもの頃はよく兄に遊んでもらったのを覚えている。
I remember my older brother often playing with me when I was little.
兄に相談したらいいアドバイスをくれた。
When I consulted my older brother, he gave me good advice.