RedactedNarrative: On 07/31/2014 at approximately 0930 hours, just outside the no ski buoys on Lake Pleasant Operator was driving his 22'' 2003 Mastercraft wakeboat bearing AZ REG.  Operator''s son was seated in the rear left side passenger seat, and his son was seated in the rear right side passenger seat.  Son2 was the ski observer while Operator''s other son Son3 was wakeboarding behind the boat.  Son3 is an experienced wakeboarder.  Son3 had been wakeboarding for about 15 minutes when he misjudged a wake and took a hard nose dive colliding against the water.  Son3 appeared fine and was loaded on the boat after he stated he was done skiing.  After Son3 got onto the vessel he appeared disoriented and was confused as to where he was, and what day it was.  Son3 was taken to Scorpion Bay Marina at which time Peoria Fire was called.  Peoria Fire transported Son3 to John C Lincoln Deer Valley for a head injury.  I later checked on Son3 and determined had suffered a concussion, but was expected to be okay.  Speaking with Operator he informed me that Son3 had decided to try and use a higher level of difficulty wakeboard that day which may have led to the hard collision against the water.  I spoke to every person on the boat, and they all had consistent recounts of the incident.  Son3 had no recollection of the entire day.