I've actually considered doing something similar by proxying all of their web traffic through my server and setting up a dynamic whitelist of domain names. I'd

I've actually considered doing something similar by proxying all of their web traffic through my server and setting up a dynamic whitelist of domain names. I'd pre-populate it with sites I'm sure are 'safe' and have it send me a notification for anything new. If I approve it, it gets whitelisted. Sounds pretty easy to implement, but it would take a long time to get my folks used to it and a sibling or two probably wouldn't hurt for efficiency.