Both of Antigone's brothers Eteocles and Polyneices filled the prophecy that predicted they'd kill each other in a battle for the throne of Thebes.
Creon, who inherited the throne, decided that polyneices was a traitor and didn't deserve to be buried, only Esteocles was. Antigone felt this was unfair so she disobeyed Creon and buried him herself. Creon found out and went to have walled up alive.
Haemon, the son of Creon was about to marry Antigone told him he was wrong to sentence her, and so did the blind prophet Tiresias, she also warned him he would lose his son if he didn’t release Antigone. Creon then changed his mind, in order to save his son, but left it too late as Antigone had already hung herself.
Haemon attacked his father and ended up stabbing himself. Creon’s wife also killed herself after finding out about her son's death,