In Kohlberg's terms, Michael's father is demonstrating Conventional reasoning.
According to Kohlberg's Structural Theory of Moral Development, conventional moral reasoning is the second of three levels of moral reasoning. At this level, people have internalized the moral standards and expectations of those closest to them and typically base their moral decisions on these standards and expectations.
In the given question, Michael is unaware that marijuana is prohibited, but his grandfather has instructed him to take it out because it is forbidden. It is unlawful, according to his father. It demonstrates that his father is aware of the laws. He believes that they must follow it since it is their responsibility, or else his son would be punished for breaking the law.
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