Home Network Setup with traffic monitoring

I've reached the limit of what I can figure out by reading forums and googling. I need help.

I have a home network (the design is below). I would like to monitor what sites my kids go to with their wireless devices and when they go to them. Basic parental controls are activated on the devices. I have looked at OpenDNS but that seems more like NetNanny than what I'm looking for.

- Fiber modem with static IP
- Wired Netgear ethernet router with standard firmware
- Wireless Asus AC66U...

Home Network Setup with traffic monitoring