Relative information between two objects means that if I observe the two objects, I find correlations: “You have information about the color of the sky today” means that if I ask you about the color of the sky, I find that what you tell me fits with what I see; there is a correlation between you and the sky. That two objects (the sky and you) have relative information is hence, in the final analysis, something that regards a third object (me observing you). Relative information, remember, is a dance for three, like entanglement.
