Sometimes called Siamese Twins, after famous Chang and Eng Bunker from Thailand (formerly known as Siam), conjoined twins re born with skin and organs fused together. On average, conjoined twins occur approximately once every 100,000 live births, but only about 5 percent and 25 percent survive past the first day of life.
As with virtually all aspects of life, female conjoined twins have a three times higher rate of survival, and male twins are more likely to be born conjoined.
Video below shows male conjoined twins performing their daily chores. They each have their own set of hands, which they each individually control, but there is only one set of legs. I wonder which one controls those.