They were born with one of the rarest health conditions in the world. They share a stomach, a liver and a private organ together. The hearts, lungs and brains of Sohna and Mohna Singh are separate and their own. The twins were born into a poor family in Delhi, India. They were abandoned shortly after birth and the Pingalwara charity raised them. The siblings, who have 2 legs and 4 arms, live in perfect harmony and are able to carry out daily tasks together.