VEHICLE WAS STRUCK BY A VEHICLE OUT OF CONTROL AND FLIPPED TWICE. DURING THE CRASH OWNER'S 2 CHILDREN WERE EJECTED FROM VEHICLE THROUGH THE REAR DOOR WHICH OPENED ON IMPACT. THE BUILT IN CHILD SEAT CLIP OPENED ALLOWING 3 YEAR OLD CHILD TO BE EJECTED FROM VEHICLE. AIR BAG ALSO FAILED TO DEPLOY.