Sai's brother is Sora cause on sai's book the cover has a boy that looks like sora
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yea, he does a sister and a brother (;
Sai did not have a blood brother, but he did have an adoptive brother named, Shin. They were in Root together, and Shin was older. Sai looked up to Shin, and carried around a book of drawn stories. He drew himself in one side of the book, and Shin in the other. As the pages were more complete, they came closer to meeting in the middle. In Root, Sai and Shin were required to fight to the death. However, Shin was terminally ill and died. Sai was not forced to fight him. In the anime version, Shin told Sai to report back that he had killed him, since he knew that he was dying.
No suigetsus brothers name is mangestsu they havent shown sai brothers face in the show yet
Karana uses sai sai as a light source.
Sai On died in 1761.