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A Raspberry Pi is a great thing to have in an elderly relatives place. You can buy one super cheap, set it up at your place, then mail it to your relative and just say "plug it in". You can pre-configure it to connect to their WiFi on powerup. You can preconfigure it with an SSH server and VNC server so you have remote access. You can preconfigure it with Calibre. And you have four USB ports on it for them to connect to at your command. You can upload/download stuff to their devices, you could have them plug in a webcam, a printer, a scanner - all kinds of stuff that would be useful for you to help them out from your home far away. They can plug it into an HDMI input on their TV so now you have a big display that you can remotely show them stuff on.
The whole thing is the size of a bar of soap. The entire setup will cost only about $50 if you go for the "Pi 3" model. If you want a "Pi 4" (which probably isn't necessary), then you're looking at about $90.
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