Shellie and Greg Tucker, along with their son Owen, 2, left, parents 

Shellie and Greg Tucker, along with their son Owen, 2, left, parents of Allison, center and Amelia, center right, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)
Associated Press
Shellie and Greg Tucker, along with their son Owen, 2, left, parents of Allison, center and Amelia, center right, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)
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