[Haha wait until she learns there's also a Norse demigod here. Whoa!! As it is, he's pretty grateful she doesn't actually ask about Bianca because despite the fact it's been almost five years it's still painful enough he avoids it where he can.]

All of us know who are mortal parents are now. [Is that a joke? Maybe!] For a while several of the gods didn't get in touch with their children and many of them went unclaimed. When Percy became the hero of the prophecy, one of the things he bargained for was for the gods to claim their children by the time they were thirteen. Some demigods over the age of thirteen might not know their parentage but gods can claim their children later in life. Annabeth knew who her mother was since she was seven, I think, maybe sooner. I learned about my father when I was ten. Piper and Leo were only claimed last year.