The family lineage originates from the first Fire Nation colonists. However, the first known member of the family is Hiroshi Sato, who was born to a poor family residing in the Dragon Flats borough in 120 AG. Later, his conception of automobiles for the common man made him a wealthy figure by the age of twenty-five. He married Yasuko and, in 152 AG, they had their only child, Asami. Six years later, the Agni Kai Triad raided the Sato estate, resulting in Yasuko's death. This tragic event was the primary factor in manifesting Hiroshi's deep hatred toward all benders, prompting him to join the Equalists to avenge her death.