A father and a son are in an accident, the father dies, the son gets transported to a hospital.
The surgeon in the hospital says: I can’t perform the surgery on this guy, he’s my son.
How is it possible?
Let’s count the maximum number of possible responses.
Surgeon is his mother. Or, didn’t specify the father and son are related. Somebody’s father and somebody’s son had an accident. Thus the son’s father could be the doctor. Or 2 Dad’s. It’s a person called ‘a son’ who was in an accident, whose parent is a surgeon.