I mean, this is so full of contradictions.
1. Did the family go there on a whim? Had they never been there? This is important. If they didn’t know the area and had no idea it was a swamp, with alligators, and had no clue where they were going, than they didn’t know the area. They would not be able to search well on their own. If Bobby went missing in an unfamiliar place, the family would not wait for hours to get help. If they had no clue of the dangers, and believed they were headed to a safe and fun lake for swimming, fishing and boating, etc they’d be ill prepared for dangers....
2. Did they know the area, and have a nice cabin they’d owned for possibly years? If they knew the area why didn’t they keep a better eye on the kids? Alligators eat people and are very dangerous. Or, did they or the uncle mistakenly believe these animals were not dangerous? For example, firefighters in Florida several years back had been feeding the local gators and thought these things were somewhat tame. Until one of those very gators killed a child at the nearby resort at Disneyworld. Could the uncle have been feeding them, maybe the dad did too? Perhaps the kids liked feeding them, or watching them get fed.
3. Did the child leave in the middle of the night? Did he sneak out of a flimsy tent? Or did he leave the family cabin? Did the boy disappear on the way back from an outing with his uncle? Or was it an outing with mom and dad that he wandered away?
All of this makes a huge difference.