Sloane indicated to Dr. Barnett that he might be Syd's father. However, tonight he said that he already had proof that he was Syd's sister father after finding about 2 years ago about her existence. Did the affair go on so many years that he thought he could father both? Or did he only recently prove that he was Syd's sister's father in the recent past although knowing about her existence for 2 years? Or did he lie and know he was not Syd's father all along? A form a manipulation? It seems that he would have done a DNA test on Syd a long long time ago.