Jellyfin for control over what your child can watch. Qbittorrent for getting the media. Immich for organizing their photos—way better than iphone images by a landslide. Jellyfin also for music. Babybuddy for infant tracking needs. I would use ghost for blogging. I also appreciate mediawiki for a family genealogy wiki. Wireguard/Tailscale for safety. Adguard for controlling what comes into the house. Stash for keeping parents happy.