You might try blending these two together https://hotkey404.com/how-to-turn-raspberry-pi-into-freepbx-based-gsm-gateway/

https://sysopstechnix.com/build-your-own-sms-gateway-using-raspberry-pi/

I suspect what you are looking for is a gsm gateway. There are many standalone implementations, some ready made, some a bit more DIY

Just so you know, you can run pi-hole as a container as well

About dhcp, I don’t know about unifi, but I guess in the firewall you can configure static dhcp leases. So son1 devices always get same ip. Then you can configure a hairpin port forwarding, so any requests for ports tcp/udp53 from his devices get forwarded to pi-hole. That is assuming that in the “general” dhcp config you assign an external dns.

Otherwise you could try creating two different dhcp pools, one with pi-hole (and make sure son1 devices get a static lease in there) and one for everyone else.

As a side note, I recommend looking into self hosting your piped instance, so even son2 can enjoy YouTube without all the ads! (And the tracking)

To each their own man. I just would not have enough memory on my potato servers to run all those VMs 😅

Why all those VMs instead of containers?

Ah, I host my own instance of piped, that solves a problem 😅

I use a rPi3 for this stuff exactly. I have about 300 movies in the folder (I know it sounds like a rookie number but I keep only stuff I know it will be watched) and kodi (through jellyfin addon) only takes a few seconds to load. My jellyfin server is not on the nas itself, it’s on a separate docker server for hw transcoding on the fly (and the nas has hdd drives).

I used the piped addon for youtube.

I use kore app on my phone to control kodi. Been working like this for about 7 years.

What’s the IP address (and related info, gateway and dns) you get on linux and what is the one in Windows?

Borg from the server to the nas, aws glacier from the nas to offsite.

Hum, not my experience. I run it on an old pc as a podman container, for me and my wife, exactly for the same use case of OP: auto uploading the pictures/videos on our phones. Upload is almost instantaneous. Browsing files is fine, but I usually use a separate software to index/search the photos on the upload directory. For all kind of files (documents etc) is good.

Systemd 😈