I don't know how to check the netdev group, but I did enter the command you gave, and I got a response that adding the user was successful.
However, it still made no difference and when trying to connect to a network, it still asks for the administrative password with the warning,
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System policy prevents modification of network settings for all users.
Once I enter the admin password it works fine. But I don't want to do this everyday for my kids PC or have to give them the admin password.