Creon is father to Haimon and is Iocaste's brother. Iocaste is Antigone's mother so it makes Haimon and Antigone cousins.
Haimon's main concern is that he be with antigone and that his father would let them be. Creon main concern is that haimon and antigone does not get married.
Haimon attacks his father, Creon, with a sword in the cavern because Creon refuses to let Antigone go free and insists on sealing her in a tomb alive. Haimon's love for Antigone and his disagreement with his father's harsh decision drive him to try to kill Creon in order to prevent the tragedy from unfolding.
Haimon likely feels conflicted, hurt, and frustrated as he leaves his father after their argument. He may also feel disappointed and misunderstood.
Antigone hangs herself, causing Haimon to stab himself out of grief. Haimon's death causes Eurydyce to commit suicide.
Haimon, Creon's son.
Haimon does
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Creon's son was Haimon.
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to lock her in a stone vault
Yes, Haemon is Antigone's cousin. His father Theban King Creon is the brother of Antigone's mother, Theban Queen Jocasta. Jocasta also is the mother of her second husband, Theban King Oedipus. So Haemon is first cousin to both Antigone and Antigone's father.