In the YH movie when Jason's father was crushingly sick, she was nowhere to be seen (I imagine if she were alive she would have been at his bedside tending to him). Also, with Jason suddenly at home they didn't show him meeting her, even when his fake uncle was like, "Jason, my boy!", and hugged him and etc. In the YH movie-verse at least, I'm guessing she was dead.
At least at the beginning of the YH series, I don't understand how his father could be dead. Isn't Jason the only heir to the throne? I know he eventually does go back to Corinth to rule, but before that it seems unlikely that the people would want their crown prince running around at hero school instead of staying inside the kingdom unless his father was still alive.
Actually, it's kind of impressive that he got permission to go to Cheiron's Academy at all. I'm certainly glad though.
