Blindspot A sad riddle

Imagine this scenario. A father and his son are driving along the winding roads of a mountain. Dark storm clouds roll overhead and the wind suddenly increases. The car crashes immediately. The father doesn’t even have time to blink. The father dies instantly on impact. His son is pulled from the wreckage and is rushed to hospital in critical condition. Just as he’s about to go under the knife, the surgeon says, “I can’t operate—that boy is my son!”

How is this possible?

Give yourself time to answer before clicking HERE for the answer.