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MacBook Pro 13" Mid 2012 i5 500 GB I have an external WD MyBook 4TB HD. Is there any way to set that up on my MacBook so its connected to the internet and everyone in my family can log into it to upload download and view pictures? We live in different parts of the country.

Sure,

  1. Go To Settings
  2. go To Sharing
  3. enable file sharing
  4. add your WD hard drive and assign users. https://support.apple.com/en-us/HT204445 Note you need a public facing IP address, or you need to map your router to point to your Mac.