Parental Controls to block internet

Not sure where to go for this.  I use a netgear N600 router and have been using Norton products for years,  My question is this, how do I control 7 different devices that access the internet from one control panel.  We have xbox360, Ps3, a tablet, 2 laptops and 2 desktops all accessing the internet at various times.  What I want is a simple solution to log into one program and switch them on or off.  When the kids are punished and grounded I from the xbox360, it is a pain to change the password to keep it off line.  I want a simple solution to manage all of the devices.  Any suggesions would be greatly appreciated.