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I've stopped recommending Plex to newcomers, because Jellyfin is ready for families now
(www.xda-developers.com)
Jellyfin is a free and open-source media server and suite of multimedia applications designed to organize, manage, and share digital media files to networked devices.
"Families" in this context doesn't specifically mean your family's niche needs. It means that generally children and/or parents can do 90% of things without tech support.
I don't actually agree at all that Jellyfin is at that level, but asking for it to automatically fetch subtitles on languages outside the top 40 languages in the world doesn't feel like a common scenario.