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Jack is the [[Nephilim]] son of [[Kelly Kline]] and [[Lucifer]]. He was conceived when Lucifer inhabited the body of [[President Jefferson Rooney]], with whom Kelly was having a relationship.
Angel's believe that Nephilim's are abominations that can destroy worlds, with Jack being the son of Lucifer, it is believed he will also be a force of great evil. However, after the Nephilim, while in uterero, gives Castiel a glimpse of the future, Castiel believes Jack will bring peace and paradise to Earth.