According to this excerpt from Book 24 of Homers Odyssey, why does Eupithes want revenge against Ulysses? because he is devoted to Neptune because Ulysses hides his true identity from him because Ulysses killed his son Antinous because he wants to marry Penelope because Ulysses killed all of Penelope's suitors

His moderate words some better minds persuade: They part, and join him: but the number stayed. They storm, they shout, with hasty frenzy fired, And second all Eupithes rage inspired. They case their limbs in brass; to arms they run; The broad effulgence blazes in the sun. Before the city, and in ample plain, They meet: Eupithes heads the frantic train. Fierce for his son, he breathes his threats in air; Fate bears them not, and Death attends him there.