He lives with me most of the time so yes, he will have one of the licenses, but I don't want him to start sharing it with everyone. I haven't install it yet on his PC coz I'm trying to figure this out first...
Currently as far as I'm aware, if you give him use of one of your licenses, it has to be connected to your Avast Account, or there would be no license available, you can view your avast account and see where licenses are applied/assigned.
I don't know if there is any way to make his installation under a limited user account, and or assign a password on his installation to prevent changes being made. However, I don't know if that would prevent him viewing the license/registration information.
Which is why I have tried to draw attention to your topic.