The fake death thought is very common. My brother drowned at the beach when he was only 17. We all stood there helpless, unable to find him. His body took some time to return to the shore, and a friend of a friend of the family was the one who identified him.

I was very young, only 7, but my cousin, who was 15 at the time, spent years searching for him, convinced the body had been misidentified. Later, when I grew older, I also went through the phase of thinking, "He was too smart and strong for that. Maybe he ran away somehow."