The Immortal and the Restless is a Parallel to William’s Life
After completing each night in Sister Location, we get to watch a clip from the TV show, The Immortal and the Restless. The TV series follows the story of a vampire and his wife who attempt to start a normal family with a young daughter that isn’t related to either of them. Because of this disconnect, the husband and wife consider a divorce, and it’s implied that the family breaks up soon after.
William relates to this TV show because it’s a reflection of his life after losing his daughter to the animatronic. Assuming that the player really is William, it makes sense that he would come home after work each day to watch this show because of how it parallels his situation. It also suggests that William and his wife split up pretty quickly after their daughter passed away.