Final answer:
Creon is the brother-in-law of Oedipus and uncle of Polynices, Antigone, and Ismene. His strict order to leave Polynices' body unburied and refusal to admit the possibility that he is wrong lead to the events of the tragedy of Antigone.
Step-by-step explanation:
The brother-in-law of Oedipus, who is also the uncle of Polynices, Antigone, and Ismene, is Creon.
Creon's strict order to leave Polynices' body unburied and his refusal to admit the possibility that he is wrong bring about the events of the tragedy of Antigone. This conflict between Creon and Antigone forms the central theme of the play.