RE: What would you do?
I guess if I had a chance with the bow to bag the big guy before the youth hunt then I would. If you see the big one with your nephew let him shoot him. Take the opoutunity that presents itself. They are few and far between. Let the young guy shoot what he wants and take a ton of pictures. Congradulate him and make him want to come back next year. That's what counts.
Good luck to both of you guys.