Andrew Silversaber Sr. was born in 69 BBY to two Sith. They were hidden, of course, and his father was head of a secret organization of Sith. At age 12, on Mustafar, Andrew's home planet, five Jedi came and started fighting the Sith. All of the Sith were killed, including Andrew's parents, and one Jedi. Andrew was enraged by this, and used the Force to shock all four of the remaining Jedi with Sith Lightning. Weakened, the Jedi could barely stand. Then, Andrew took his dead father's lightsaber and killed the Jedi. Andrew was now a Sith. And he then went out and faced the Galaxy like one.