A man and his son are driving down a road in the rain at night. The father cannot see anything ahead of his car, and slams on his brakes and swerves trying to avoid a ditch. Unfortunately the wet roads caused him to slide and he crashed into another car. The father was killed instantly but the son survived, but was in need of surgery. Paramedics quickly brought the boy into the hospital. The surgeon took a quick look at the boy and said 'I cannot perform this surgery' when the rest of the employees asked why, the surgeon
said 'Because this is my son'. How is this possible?