Hisui

Miroku and Sango's son was their first (And presumably only) son.

History
Miroku and Inuyasha were off exterminating a Yōkai while Sango was giving birth to her third child. Rin and Lady Kaede were present during the birth. The birth had been successful by the time Miroku returned to his family.

Physical description
Miroku and Sango's son is a small, newborn baby. He has a small tuft of light brown hair atop his head, and his skin matched the light tone of his parents. In the one shot manga special, InuYasha Since Then, he is 6 months old and is shown to resemble his father.

Trivia

 * His name is not revealed along with his older sisters.
 * He appears in the sequel series as a demon slayer, having inherited hiraikotsu and partnering with Kirara. He also wears prayer beads on his left arm.

Media appearances
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Manga

 * Chapter 558
 * InuYasha Since Then

Anime
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 * Episode 26 (FA)