For the Better or Worse

AU. James Potter, notorious Dark Wizard, married Bellatrix Black. 8 years on, when they are captured and sent to Azkaban, their elitist children are sent to live with their blood traitor relatives, the Malfoys, who regard them with a sort of malicious disdain. Will they remain paragons of darkness and death? Or will they be turned to the Light? And what about Theo Nott? Dark!Fem!HP