I can relate to another person in different ways. For instance, I can talk to someone. I can think about that person when away from them, or in the middle of talking to them. Later on, I can think about the fact that that person is in my life. I can think of a person as an era in my life, or a set of cascading consequences, tendencies they instill in me, consciously or unconsciously, tendencies causing new tendencies. It doesn't really make sense to attribute the further reaches of the fact of someone being in my life to the person themself, call them extensions of that person. So instead of calling them "the person of So-and-So" or simply "So-and-So", we can call them "the life reality of So-and-So".