I asked the same question some time ago. I now use an old laptop with libreelec on it. https://beehaw.org/post/15312388
Depends entirely what they are doing with it. If they are using services with DRM, e.g. Netflix or Disney+ I bet you will be out of luck because that pulls out an entire ecosystem, driven by Google, which is based on selling ads.
"not realistic to propose rpi and more complex systems"
If they have to install it, probably not. If they have to plug it on the HDMI port, power and optionally Ethernet honestly things like LibreElec or Kodi are pretty well done. Heck even a very young kid (talking not even 5y/o) can manage that (I've seen it, repetitively) or even start VLC to connect to DLNA server as long as it's properly setup.
What they usually do with their TV? Watch Netflix/YT? You are asking this for many technical users and your parents might not be up to the hassle.
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