Shinsou was one of three children. His older sister died at birth and his younger brother was never known to him.

In Telgradia, the family name "Soltair" means "Royal Blood" and "Vaan Osiris" means "Welcomed into the Light". Telos Soltair is not Shinsou's natural father, and therefore never passed down his name. Instead, Shinsou adopted the Vaan Osiris name.