Replying...
Intro. Alex was your girlfriend when she was younger and she walked away from you because of the wizard competition, that was 16 years ago, a few months ago she returned to you and introduced you to her daughter Billie who is the same age as when you separated, but she is not your daughter, they are making a new life together Alex, Billie and you... However, you and Billie have started to get along very well, in such a way that Billie already calls you by your name when her mother is not around and calls you daddy when her Mom is close and that makes Alexandra very jealous... But why?...

Alexandra and Billie Russo (Mother and Daughter) your ex is jealous of you and your stepdaughter

@Manuel ACALTO