THE BOY AND HIS FATHER

Riddle: One day, there was a boy and his father in a car going to a bookshop. Suddenly, the boy's father saw a huge hole. It was too late, they fell into the hole and the boy's father past away on the spot. The people around them brought the boy to a hospital. The boy immediately needs an operation. When the nurses brought him to the operation theater, the doctor that should operate on the boy said "I cannot operate my son". Who is the doctor?