Chapter one:

Everyone that the Winchesters all knew were dead, Castiel, Crowley, Rowena and even the twin sisters, Kelly and Kaida Kline. Their own mother, Mary sacrificed herself as Lucifer dragged himself and her into the rift, encased them in the Apocalypse World. All who were left were Dean and Sam and the two newborn cousins. The Nephilim and the Nephalem. Sam looks to see, flickering light inside the house, as he glances over at Castiel, and then runs toward the inside house.