Man Vs Wild Saves A Boy In The Woods

screenshot_0117Home Alone in the woods:

When he realized he'd been separated from his family on a weekend hike in a northern Utah forest, 9-year-old Grayson Wynne's thoughts turned to television.Grayson watches "Man vs. Wild" on the Discovery Channel every week with his brothers and his dad. On the show, host and adventurer Bear Grylls strands himself in the wilderness and then shows viewers how to survive the sticky situations.That's where Grayson says he learned to leave clues behind to help searchers find him.

Read the article here. At what point did his parents realize he was gone? When they got home?