[For Family] iOS 8 erased majority of pictures. What to do?

My dad just called me, angry at me (for some reason). Earlier today, my grandpa had updated to iOS 8.0.2 and complained all but 39 pictures was erased from his iPhone 5. This issue did not happen with my iPhone 5, so I'm not exactly sure what to tell him.

Everything else is normal, though. Like always, I told them both to backup first (which they did) and now they're just confused and mad at me. I believe hearing about a few problems but can't find anything specific.

 

Yep. I was telling them that before I called and turns out they were looking in the wrong spot. Everything's there.