View Browsing History on all devices on our home Internet / WiFi

How can I view / monitor the sites visited through our wifi?  I use all Parental Controls but I can't find out how to view where my children have gone on the intranet.  Xfinity assistant told me Norton offered this (included with Xfinity) but Norton told me they only schan computers for threats.  Browsing history on each device can be deleted so looking at the device won't work.