Like others have stated, when in public, show a small amount of encouragement/work. Just be the adult there. But when at home, like my mother did, be the parent. Just ask how its going, what are the plans so far, etc. Try not to seem pushy, as this will upset him, however, just be curious.
My Eagle Project consisted of raising money to collect and distribute smoke detectors to everyone in my school. This was after a good friend of mine, who went to my school, passed away along with her little sister in a house fire. They did not have a working smoke detector in the house, and this sparked an idea that snowballed into an Eagle Project. However, theres always a bad side to things.

My project was approved by my troop and council, but theres always those people that you can never satisfy. And those people were raising ruckus at council becuse they viewed my project as a fundraiser only and did not count. So I was not only trying to do the project, I was trying to do it in a manner that would have the least ammount of dispute. I understand totally that you cant please 100% of the people 100% of the time, however, I was looking to the least ammount of argueing because of the reasons for my project. I however stated to people many times that I am raising money just like any other project. I am buying my supplies, which is somke detectors, instead of wood, nails, etc. And instead of building something and giving it away, I am just giving them away. I offered top install them if needed, well, to have my team that I had ready to install them.
Overall, the project went off well. The whole time, my mother would just sit back and let things go in public. However when we were at home or anywhere else, shed ask questions about it and talk to me and guide me in the right direction. That was the best thing she could do, and she did a good job too!
