Question

Why does sophocles alert the audience to the romantic relationship between antigone and creons son in scene 1 of the play antigone

Answer 1

It is likely that Sophocles alerted the audience about this romantic relationship in order to highlight the interconnectedness of all the characters, and the unexpected consequences that our actions can have. The fact that Antigone and Creon's son are in a relationship only makes the conflict between Antigone and Creon more difficult. This turns out to be true towards the end, when Antigone's death causes Haemon's sui.cide.

Answer 2

This has been answered here before. 
brainly.com/question/1400030

I hope that helps a bit. :)