FORT WORTH, Texas — The advent of DNA test kits has helped millions of people discover intricate details of their heritage. They've also uncovered hundreds of thousands of family secrets that some parents preferred would have stayed hidden. But in Fort Worth, Michael Bennett has uncovered a world -- and a happy ending -- he never fully imagined. "My parents never hid the fact that I was adopted," Bennett, 70, told us from his Fort Worth home, where one room is filled with the memorabilia, commendations and photographs of a rewarding military career. And in one corner, a picture of...