Kai would expect he's being mocked, except that they have this bond, except that he can feel a certain genuineness coming from Marco through the connection that they have, and he can feel that the connection does exist.

"I was raised by humans," he says, which is both true and not, since he's too old for that, and the elfin don't give up their children easily. "Don't figure this is the sort of thing you let them know about." So Kai doesn't know, like he doesn't know so much about his people. Usually that's fine by him. Usually he'd rather they not be his people.