I can totally understand the family's feelings about wanting to know every little detail about what happened.
Hubby and I lost our lifelong best friend in a car wreck a little over 2 years ago. He hit a patch of black ice, spun out, hit a culvert, was thrown across the vehicle (no seatbelt), and partially ejected through the windshield. Even though it was an obvious accident, I still had so many questions about EXACTLY what happened. In my mind, there had to be a reason he hit the ice. Could he have swerved to miss another vehicle or an animal? Did someone run him off the road? Had he dozed off? Worst of all, there were discrepancies in the time the accident happened. It could have been as long as 12 hours before he was found. That sent me into an awful spiral of worrying how long he'd laid there in the cold, partially ejected through the windshield, suffering. I needed answers to those questions before I could even begin to process that he was gone. It took a long time for me to finally accept that I'd never have all of those answers, but at least I got the answer to my biggest worry: he'd passed away instantly due to a broken neck, and thankfully hadn't suffered.
Anyway, I completely understand Riley's family for needing answers. I hope they find all of those answers. If not, I hope they can eventually come to peace with any questions that just aren't answerable. <3