Separated at birth

The idea of twin telepathy has been around for well over a century. The 1844 Alexandre Dumas novella, “The Corsican Brothers,” tells the story of two once-conjoined brothers who were separated at birth yet even as adults continue to share not only thoughts but physical sensations. As one twin describes, “However far apart we are now we still have one and the same body, so that whatever impression, physical or mental, one of us perceives has its after-effects on the other.” 

— The Riddle of Twin Telapathy