Not sure what to say about the other stuff, but I'm pretty sure Elfangor would try to break the news to Tobias. Remember how upset he was in AC when the Ellimist yanked him away and he learned Loren was pregnant?
It was pretty much "Woah! I have a kid, dude! This changes everything, you can't take me away from that!"
Oh man, now I have the whole Darth Vader/Luke Skywalker thing in my head. Except with Elfangor and Tobias.
Elfangor: No, I am your father!
Tobias: It's not true!
Elfangor: Search your feelings, you know it to be true!