With the way mom and pops feel about gun shots I wouldn't worry to much. Start by smacking a couple of chunks of lumber together when he is having a good time. If he stops what he is doing get excited and praise him for a bit. Before Mickey herd her first shot she would get excited if you even pointed a gun or a stick for that mater at something. With no bird training at all she maid a half dozen water retrieves her first time on a duck hunt.

Your going to end up duck hunting again arnt ya.