A neighbor has a desktop computer in their den/office with a DSL line from AT&T or Earthlink... I think they even still run a PPPoE client on the desktop vs a router or modem. Anyway, I think they want to let the other computers in the house which I recall were desktops join the Internet connection.
They have a Dlink WiFi router that one of the boys got somewhere, but have never hooked everything up and migrated from the desktop client to let the WAP do all the work.
Anyway - I was thinking of what hardware options might work best.... I have a couple of Netgear AC powerline modules that worked ok for me.. On the WiFi side - a USB might be good - parents could pull them out at will.. or the classic PCI board with the rubber duck antenna.
Will have to see this weekend what they really have and go from there...