Missing devices from network

Hello.  I am trying to find devices that I know are on my wireless network and am having a real difficult time.  I have the G3100 router and am missing a bunch of devices.  I checked my cell phone, iPad, and children's iPads via mac address and am coming up short.  How can this be, since they are all connected to the internet?  I could see one device missing, but all of them?  I see a bunch of devices, but none that I am looking for.

The only reason I noticed this issue is because I shut down internet for the kids devices, yet they still have internet access.

Someone please point me in the right direction.

Thanks in advance.