Hard-working 'couple' revealed as four twins A married couple who astonished diners at their restaurant by appearing to work 21-hour days have revealed the secret of their labors. Customers dubbed the pair the “robot couple” because of their marathon hours, which involved opening the restaurant at 6am and apparently still being there to close it up at 3am. But it has now emerged that the restaurant in the city of Yiwu in eastern China is actually run by two couples – and both the men (Mao and Zheng) and the women Yan and Ling) are identical twins. The twin brothers married the twin sisters three years ago, and the four of them decided to go into business together. Both couples each have a young son and they look very similar...Using your knowledge of meiosis and/or biology, PREDICT whether the child of the couple on the left is genetically identical to the child of the couple on the right