ID's relative is a term used to describe the relationship between the superego and the EGO. The superego is the part of the psyche that acts as a moral conscience, while the EGO is the part of the psyche that mediates between the demands of the ID and the superego. The superego is the higher-level part of the psyche, while the EGO is the lower-level part. The two are related in that the superego provides guidance to the EGO, which then helps to regulate the behavior of the ID.