Hi - I spent a decade acting as a medium between two twins. One would be in the world and the other would be in the spirit realm. This is where the theme of reincarnation comes in. Various incarnations led to the 'reunion' process. From my experience - this reunion starts from within rather than on the outside. In this regard - the 'twin spirit' acts as a 'divine messenger though the 'unconscious' connection that is always present in spirit.