Thank you for reading and your reply. I'm not sure that asking if he wants an update, is the right thing to do. I say this because everyone he works with, (it's a boat) can read these emails. As far as I know, and I know this about him, he literally does not talk to anyone about his private life. Thus, it would be strange for the "wife" to send an email basically asking permission to email him about his daughter. Any contact thus far via work email has been strictly business.
Oh wow, well that's a strange situation. Can they all read the replies he sends as well? Because you could be putting him in a tough spot, he told you not to send anything, so if you do and they can see his replies then he can't tell you to stop because that would look strange too. I would be inclined not to send him anything. If he asks about D, THEN you can send him something.