Emotional demands and expectations go together
For most organisms, including humans, the developmental trajectory involves an individual becoming more and more capable and responsible for taking care of their own needs. Maturation is associated with the ability to function independently. As a social species, humans needed to find a partner and have children in order to survive as an extended family unit. Single families would have had a very hard time surviving on their own. This creates the need and expectation that members of the group would care for each other. A mature understanding of this recognizes the benefits and costs of interdependence so the group can survive. An immature understanding of this has unrealistic expectations of others and makes demands of others. This is pretty clear when one is talking about physical needs like food, shelter and protection that protect our physical self.