I think https://fission.codes/ecosystem/wnfs/ might do what you want (though I don't know about viewing photos in browser etc).
Alternatively, IPFS supports unixFS and a mutable filesystem through the desktop client if you are happy to host them on your own machine (it acts like a unix dir)
edit: ah sorry, I see you actually asked for a private network. You could possibly look into https://ipfscluster.io/, though it might be a little heavyweight for what you're looking for
It's not a necessity, but also understandable that if you had that experience yourself you might feel you've failed as a parent if you can't provide that same experience (or better) for your child.
I've found wine good enough to run nearly any windows programme I want to use; the only exception is VR games, but I've found myself just not playing VR as a result
Sure - the next corporate ship will torch VC money until they can't, they'll go user hostile then the next corporate ship will have received VC money to torch to fill the void
I'm amazed that we're still entertaining banning everything in 2023.
The same song and dance was made of TV 30-50 years ago, keeping kids off the internet 15 years ago, and I'm sure for keeping kids off AI in a few years time.
The cat is out of the bag, and trying to force it back in the bag is going to be no better for kids
edit: ah sorry, I see you actually asked for a private network. You could possibly look into https://ipfscluster.io/, though it might be a little heavyweight for what you're looking for