How DNA testing can rip families apart -- and bring them togetherAnnalee Newitz9/30/13 1:51pm283EditPromoteGo to permalinkTwo women from shattered homes have been using DNA tests to discover why they have always felt like outsiders. They find each other on a social network for people who want to compare their genomes — and they get a match. Are they related? Did their parents have an affair? New DNA services promise to help them find out.