Boris, stop this right now. You are making yourself look ridiculous.
Conjoined twins do not occupy one body. They don't even share two bodies. They are two individual people who were born physically joined at some point or points.
Unequal conjoined twins are also known as asymmetrical conjoined twins. One of them relies totally on the other for its survival and is known as the parasitical twin.
That wasn't a joke you made, by the way. It was a very unsubtle snidey remark. I send snidey remarks straight back to the recipients with knobs on, especially when they barely skirt the rules.