How to Say ‘Someone's younger brother’ in Japanese
弟さん
otouto san
[oh-TOH-toh sahn]
💬 Usage Tip: Younger siblings just get さん added, with no お in front: 弟さん, 妹さん "someone's younger sister".
Phrase Breakdown
弟
otouto
[oh-TOH-toh]
younger brother
Younger brother; alone it is humble (otouto), with -san it refers politely to someone else's.
弟は高校生です。
My younger brother is a high school student.
さん
san
[sahn]
Mr.; Ms.; polite suffix
さん is a polite suffix attached to people's roles or names, adding respect.
おじいさんがきました。
Grandfather came.
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