Vampire Bonding 2

For 27 years Sylvia had been living with the thought that someone might confirm that she is a vampire woman. Her mother was always constantly avoiding her questions, refusing to discuss the question of vampires. However, they both know that William is a vampire and he is their blood relative. Even so, being related to vampires does not mean they are vampires as well, but Sylvia still imagines that she is a vampire, but no one wants to confirm her birthright...
Her cousin William has a habit of telling her friends that Sylvia is her cousin; they all know that he is a vampire, and Sylvia does not need more pressure added to her already stressful life. William himself does not care about people's comments or opinions. He does not think it necessary to pretend to be something else. Why should he try pleasing mere mortal human beings...
Sylvia has a few dark fantasies waiting to manifest, but no one suspects that she can entertain such thoughts. Should she become a vampire woman officially, she would begin practising, everything she kept hidden. deep within her inner being. In the meantime, her frustration grows causing her to become even more opinionated, challenging her mother seeking answers...
Her boyfriend, David, is also a vampire, but the issue is never up for discussion. He knows though that William is a vampire and Sylvia is trying to hide everything, pretending to be a normal human being. Whereas being a mind reader, he can discern her status as a vampire woman, but he does confront her...
His friendship with William started during their schooling days; they were always discussing vampire issues moving forward. Beatrice and William are close friends; she owns a tennis academy and she invites David to her home. David and Sylvia became members of the tennis academy but she has no idea how to play tennis. Monica sees David, and she decides to play a love game. David himself has a weakness for sexy women. Monica challenges Sylvia to play just one game. Being a mind reader herself, she is aware of her motives, and she accepts..
Among the spectators is Beatrice's assistant Stefanie, who recognises Sylvia's stance, thinking that she could be a good player. Sylvia wins the game 6-4, David is beyond himself with pride, he decides to propose to Sylvia, dashing Monica's hopes of being with him...
When her mother sees the engagement ring, she becomes excited and tells everyone she knows about the forthcoming marriage. However, Sylvia does not approve of her actions. She becomes furious when Sylvester appears, claiming to be her father...
Why was she rejecting him as her father?