I’ve built Tellybox to specifically control what and how long my kids can watch anything.
It has a visual indicator (sun going down) that tells them how long they have remaining and that works quite well to remove any discussions (well… screaming and shouting)
https://github.com/sandermvanvliet/tellybox
As others have said in adjacent threads, kids are hard, every situation is different.
I dont have kids (but may in the future) and one thing I'd like to do before then is get a NAS /plex server and build a kid friendly UI on top of it to keep them off of youtube/netflix/fire tv and greatly limit the content available to them to high quality vetted stuff. Acquiring the content for the server may be its own project in and of itself I admit. I also want to do this for myself too, but I especially want it should I have kids. I'm excited by some of the recent examples of hacking smart TVs too, which seems complimentary.
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This is awesome, great work! I'll be back in a few years ;)