What was the relationship between Esther and Haman?
Esther invited the king and Haman to two banquets. At the second, she told the king that the enemy of her people was Haman. Esther 5:4, 8; Esther 7:3-6
What the Bible says
Esther 7:3
Then she answered: If I have found Favour in thy sight, O king, and if it please thee, give me my life for which I ask, and my people for which I request.
Douay-Rheims Bible (Challoner revision), public domain.