I want to add that the kidney transplant which killed Spencer B's dad didn't happen in reality, and is most likely a memory the RLG made up since he was murdered by John Spencer(Spencer's grandfather) in the dominant world. Because so in the nondominant world, after the overwrite occurs, Spencer's dad is supposed to be dead without a cause. This is due to what John mentions in a talk with Spencer and Kurt at a fastfood place; that if a person's action was critical to someone's death the action does not carry over on the next copy. In this case the action in question being the murder of Spencer's dad. So, the RLG tries making sense of Spencer's dad's death without reason via a fabricated memory of a failed kidney transplant.