Queen Esther daughter of Abihail and Mordecai the Jew wrote ... this second letter

Esther was the daughter of Abihail. Esther and Mordecai wrote the letter.

Abihail

Esther's father and Mordecai's uncle. See how you translated this in Esther 2:15. (See: rc://en/ta/man/jit/translate-names)