RETURNING FROM A TRIP TO MI BACK TO MY RESIDENCE IN TN. AS I MADE A TURN INTO MY SUBDIVISION I STARTED TO ACCELERATE TO MY NEXT TURN WHEN I EXPERIENCED A SUDDEN ACCELERATION OF MY VEHICLE. I HAD BEEN USING THE VEHICLES CRUISE CONTROL AS MUCH AS POSSIBLE DURING THE 10 HOUR DRIVE HOME SO IT FELT FAMILIAR, LIKE THE CRUISE CONTROL WAS TRYING TO ACCELERATE MY VEHICLE. AS THE VEHICLE WAS ACCELERATING AND I WAS STEERING THE THROUGH THE CURVES IN THE ROAD I HAD REMOVED MY FOOT FROM THE GAS PEDAL AND TRIED HITTING THE CRUISE CONTROL OFF BUTTON SEVERAL TIMES. THIS HAD NO EFFECT IN STOPPING OR SLOWING THE ACCELERATION. THE TOTAL DISTANCE FROM MY TURN INTO THE SUBDIVISION TO THE END OF THE ROAD OR NEXT INTERSECTION WAS ROUGHLY 250-300 YARDS ALL DOWNHILL SO WE PICKED UP SPEED QUICKLY. BY THE TIME I REALIZED I COULD NOT EFFECT OR SLOW DOWN THE ACCELERATION BY SHUTTING OFF THE CRUISE CONTROL MY NEXT THOUGHT WAS TO HIT THE BRAKES BUT WE HAD RUN OUT OF ROAD. AT THIS POINT I CHOSE A DIRECTION WHERE I SAW NO HOUSES OR LARGE TREES. WE HIT AN AREA WHERE IT SLOPED UP ABOUT 30 DEGREES THEN FLATTENED OUT THEN SLOPED UP AGAIN COMING CLOSER TO OTHER HOUSES. I'M GUESSING WE WERE TRAVELING ABOUT 50-55 MPH WHEN I WENT OFF THE ROAD. WE FINALLY CAME TO A STOP AFTER HITTING BOTH SLOPES AND THE CLOSEST HOUSES BACK YARD DECK AND THEN INTO A TREE. I HAD MY FAMILY IN THE VEHICLE WITH ME; MY WIFE, TWO SONS AND DAUGHTER. ONE OF MY SONS WAS TAKEN TO THE HOSPITAL VIA AMBULANCE FOR BACK PAIN AND A CUT ABOVE HIS EYE