Surgeon

On a dark night a car with 2 people raced along a narrow road. Heavy rainfall left the driver with bad visibility, and the card crashed against a tree when the driver lost control.
Police quickly discovered that the father was dead, but the passenger, his son, was still alive though injured and in critical condition. An ambulance raced the son to the hospital. The surgeon, seeing the patient, cried out:
“Oh no, he is my son!”

Explain.

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