RedactedNarrative: Subject was operating a jet ski beside his father''s boat on Old Hickory Reservoir. His father (operator2) put his boat in neutral and the son kept idling forward. Operator1 went to make a sharp U-turn without looking to see where his father was located. When Operator1 made the turn it caused his jet-ski to hit his father''s boat head on. This caused small amounts of surface damage to his father''s boat but resulted in the jet-ski sinking.