In part 4 we discuss Josh's hasty move from West Valley to Puyallup, Washington. It was bittersweet for The Cox family, as they got to be closer to their grandson's, yet Josh continued to make their lives a living nightmare. 

Sources: "If I Can't Have You: Susan Powell, her Mysterious Disappearance and the Murder of Her Children" by Gregg Olsen

"Fatal Friends, Deadly Neighbors" by Ann Rule