Currently we don’t have anything in the App that cordons different lights to different people. The problem is that our network protocol doesn’t support any permission model. This means anyone can sign into a different account on the app (or create scripts/apps themselves using the LAN protocol) and as long as they’re on your network, can control your lights.
You can however have multiple networks (that would likely share the same internet connection) and your son only has the password to the network that has his light on it.