Elliot Sardick was the father of Kazran Sardick.
Elliot was born in 4302. He disciplined his son harshly, seeking to instil his own traits in him.
When Kazran came of age, he handed him his machine, which controlled the cloud belt of the planet, to use to control the people of the town "like cattle". Elliot used isomorphic controls to ensure it only worked for Kazran and himself
As Kazran grew older, he became more like Elliot Sardick, so much so that his younger self mistook his older self for his own father. After Elliot's death in 4378, Kazran remained so fearful of his father that he couldn't even stand to be in sight of the painting of him. The Doctor theorised that the reason Kazran feared Elliot and despised Christmas was because he was terrified of becoming like his father. The Doctor assured Kazran that he wasn't because Kazran did not hit a child.