RedactedNarrative: Operator advised he purchased vessel the morning of the accident and took family to lake to fish and try out the vessel. After about an hour on the lake, the operator stopped the vessel to fish. Conditions on the lake were very windy and operator decided to move the boat to a more sheltered location. Vessel would not start. Operator attempted using the trolling motor to navigate to shore but the strong wind kept the bow turned downwind allowing the vessel to swamp due to waves coming over the stern. All 5 occupants entered the water as it swamped. Phone call for assistance was made by passenger 1 prior to the vessel sinking. Approx 15 minutes after the vessel swamped, a passing motorist saw the subjects in the water and called to report the event. All subjects were able to swim to the shoreline. Ems arrived approx 25 minutes after the vessel had become swamped and transported the 2 victims to the hospital to be treated for hypothermia . The vessel eventually sank and attempts to locate it have been unsuccessful. Area of the accident was approx .5 miles south of the us 64/412 arkansas river bridge and approx .3 miles west of us 64 highway.