RedactedNarrative: On 06/20/15 Operator and his family were boating out on the Mississippi River Pool 13. Operator was operating a 1981 25'' Tahiti Emperor (IL9056GH).  He was accompanied by his wife (Wife), mother in law (Mother in law), and his two children (Subject1 and Subject2). They decided to stop on Breezy Island sand bar with some friends. They noticed storms coming in and the waves starting to get bad so they decided to try to beat the storm back to Sabula Marina.  Operator helped push off his friends boat and then started Northbound with his family in their boat.  
   
  At approximately 12:55P.M., they were traveling Northbound from Breezy Island when they went up on a wave.  Operator instructed Mother in law and Wife to put on their life jackets.  Subject2 and Subject1 already had theirs on and were below in the Cuddy Cabin with Mother in law.  Wife was standing beside Operator.  As they came down off the wave, a large wave came over the bow of the vessel breaking out the windshield and filling the Cuddy Cabin with water.  Mother in law handed the children to Wife.  The water from the wave rushed to the stern and the engine.  The engine shut off and Operator was unable to get it started again. The stern of the boat began sinking.  Operator verbalized they were going down, to get off the boat and grab something that floats.  
   
  Wife had a hold of subject1 and they were holding onto a floating seat.  Mother in law had Subject2 and they were doing the same.  Operator had a hold of an orange flag and started waving it for help.  A barge nearby saw the boat go under.  The captain notified the coast guard and utilized their horn to let other boaters know they were in the water.  Witnesses nearby in a small jet boat came to their aid and took them into shore until emergency personnel were able to respond. Savanna and Sabula Fire Departments responded along with the U.S. Fish and Wildlife Service.  
   
  They were transported to Sabula Marina by the fire boats.  Wife suffered a cut under her left eye and bruising to her legs below her knees.  Mother in law had a head injury with a black right eye.  Mother in law and Wife waited for medical treatment until they returned home.
  
  Lawson Marine removed the sunken boat from the river on 06/20/15.  They were able to get most of the water out of the boat and tie it up at their Marina.  On 06/21/15, I (CPO) took pictures of the vessel in the water and out of the water at Sabula Marina.  I was able to get written statements from a subject who responded and removed the vessel.  