For a given value of 'parent', he would likely count as this towards Zannah, albeit more in the sense that he is The Corrupter and put her through a Training from Hell, not that he was ever pointlessly cruel to her for no reason.
He destroyed the obsolete original Sith Order and created his own. Star of the Darth Bane trilogy of novels. 'I am the Dark Lord who will restore the Sith to glory.
