Roberto comes home from his third-grade class and insists that his younger siblings "play school." Roberto assumes the role of the teacher, and he makes his siblings be the students. According to George Herbert Mead, Roberto is in which stage of development?

The play stage

Explanation:

George Herbert Mead was a social psychologist who later studied about self and how an individual develops his self by social interaction. In the process of self, the individual has first seen himself from others' perspectives. This concept also called The looking glass self.

In the game stage or play stage, children learn to play different roles and interact with those roles play. Children learn different types of interaction with different purposes of the people. At this stage, children are aware of the different responsibilities of the people observing in the restaurant during the dinning.