Cajeiri is the son of Tabini-aiji and Damiri-daja. His parents raised him until he was approximately five, then sent him to his great-uncle Tatiseigi, a conservative member of the court. During his stay there, he had a notorious accident in which he rode a mechieta across wet cement just laid for a new patio, requiring the work to be redone. After this incident, his great-grandmother Ilisidi took over raising him for a time.
He went with the paidhi-aiji Bren Cameron and Ilisidi on the ship Phoenix to Reunion Station, during which time he made acquaintance with several human children, including Irene, Gene, Artur, and Bjorn.