Those are the Hinson twins. PBS had a special about them years ago when they were 7, then shortly after, Oprah had them on. They share many internal organs including A VAGINA. Little known gia fact: I have a conjoined twins fascination. Ask me anything about conjoined twins.
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"What I do know is that if Karen Carpenter and Mama Cass Elliot had shared that sandwich they'd both be alive today." -Michael K