おとうと、ダイ、デ、テイ
otōto, dai, de, tei
younger brother; disciple
弟さん
おとうとさん
otōto san
younger brother (polite)
弟
おとうと
otōto
younger brother
義兄弟
ぎきょうだい
gikyōdai
brothers- and sisters-in-law
Revision:
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弟さん
弟
義兄弟