Stranded

(if Chase had been 13 when Leo moved in and 14 after You Posted What)

Chase was kidnapped when he was 14. His GPS was disabled, and he was dumped on a large island.

But is Chase the same Chase they remember?
The captain of the ship said that they won't be coming back for him.

One year later, Donald Davenport purchases a large island and builds a vacation house next to the ocean.

Adam, Bree and Leo venture inland to explore, and finds somebody they never thought they'd see again.