I would get an esp8266 (banggood.com $5) and an arduino nano. You can build a little sealed box with just a single switch and a LED on the outside. Kid flicks the switch, the light comes on and they know Daddy will look at the webcams. I'm happy to help you with the arduino code if you choose to do this.

IronKey comes with a good password manager. I find it invaluable for remembering everything for me.

Surely any mildly tech savvy student has locked down the security settings on their facebook account so that non-friends can't see anything?