[malditogeek]

https://apprtc.appspot.com/ and https://appear.in are probably the most KISS Skype alternatives out there. Of course, built on top of WebRTC.

I've been working myself on an open source alternative http://vmux.co (code: https://github.com/malditogeek/vmux) but it requires a Twitter account to log in which my pose a problem to your dad. (The upcoming version will allow you to use it without an account tho)

To the people that want to host their own "skype alternatives" have in mind that it's not just serving the HTML+JS. WebRTC needs a way to bootstrap the P2P connection, the so called signaling, vmux provides a signaling mechanism using websockets but you'll still need a STUN server (I'm using the Google's one) and optionally a TURN server to relay users behind crazy NATs.