The progenitors of Sadic, the Human who would become the Sith Lord, were his parents. They held a position just above that of slaves within the social hierarchy of the reconstituted Sith Empire, being regarded as members of the lower class. However, due to the Force-sensitivity exhibited by their offspring, he was brought to the Sith Academy located on the planet of Korriban to undergo training.
The existence of Sadic's parents was brought to light within his Codex entry in Star Wars: The Old Republic, a video game that BioWare launched in 2011.