Operator took his nephew out for a day of fishing.  15 minutes later Operator stood up to hand his nephew a bag.  It rocked once and then flipped over, throwing them both in the water.  Passenger attempted to save his uncle but he started pulling him under so he swam back to the overturned vessel and threw his uncle a Type II pfd because he could not swim.  He attempted to turn the trolling motor over of the boat in an effort to power the boat over to his uncle but the trolling motor propeller got wrapped up in his tee shirt.  He as able to push the boat to where he had left his uncle but he had disappeared.  He swam to shore.  About an hour later divers found the body of the deceased.  Cause of accident overloading, improper loading and unsteadiness of operator while standing, shift of weight in vessel with gear and inadequate # of PFD's.
Sheffield                     