Hmm:
1) Memory wipe?
2) Mind control?
3) Something new and exciting?
4) Or is it just the same typical bullshit where he has to pretend he doesn't know his daughter to protect her...instead of, you know, telling the obviously intelligent girl what's going on and helping her secretly?
Yeah...it's number 4, isn't it?
I've said it many times before. As an author, if the only thing you can come up with as your "big obstacle" is fixed by having one little conversation, it's not a big obstacle.
If it is number 1 or 2, I retract approximately 50% of my statement and apologize. If it's number 3, you get the prior arrangement, AND 5 cookies.