"Twin Sisters" tells the story of Mia and Alexandra, identical twins from China who were adopted as infants by different families—one from Norway and the other from Sacramento. The adopted mothers had met during the adoption process and noticed their similarities; a year later, after DNA tests proved what they suspected, the families set out for the siblings to stay in touch. And when the girls reunite at age 8, despite differences in their upbringings, they prove to be remarkably similar.