He doesn't seem to care for her stare at all. "If you must know, the Titans are trying to take over our world. Their minions are running rampant, and he's got a part to play in the Fate of the World." The capital letters are very audible. "He's a demigod."

Not that he runs around telling people he had a child - or children - with a goddess, but it's relevant at the moment. "Not everyone can fight them. ... I can. So I have to." There's a hint of exhaustion in his voice, but his father either doesn't or chooses not to hear it.