弟弟 refers to a younger brother.
Think of your younger brother as a little buddy who looks up to you and follows you around like a shadow.
姐姐 (jiějie): Refers to an older sister.
兄弟姐妹 (xiōng dì jiě mèi): Refers to siblings.
哥哥 (gēge): Refers to an older brother.
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