弟おとうと息子むすこ

noun

younger son

Refers specifically to a younger son, as opposed to an older son or a younger brother. Not a common everyday word; more often seen in literary or explanatory contexts.

• 彼かれは三さん人にん兄きょう弟だいの弟おとうと息子むすこだ。

  He is the younger son among three brothers.

• 弟おとうと息子むすこはまだ学がく生せいで、兄あにはもう働はたらいている。

  The younger son is still a student, while the older brother is already working.