Birds were still roosted at 9:30 AM? Did you bust them walking, or with the vehicle? Did you hear birds gobbling?
I do agree with Tom007... Get in early with no lights if possible (at least an hour before sunrise), get comfortable, avoid talking... Do not call before hearing birds call, and keep calling to a minimum... All of which can be difficult with a younger child...
If you can, choose a spot you can hide well, and maybe even take something you can use as a ground blind, so the child can move a bit. Also, when my kids went when they were younger, I took a thick jacket for them to lay down on, and sleep while waiting for the sun to come up, and the birds to wake up...
Hunting with a child, if you are not opposed to decoys, I would set up a hen/jake setup... Put the jake where you want the shot to be. Be prepared for some pellets to go into that decoy.