A long riddle...

[Andyfawcett]

A father and son are on a skiing trip in Europe. They are having a brilliant time on the piste when all of a sudden a horrific avolanche completly covers them in snow. The rescue team drag the two bodies out. The father is dead but the son is still breathing. They take the boy via helicopter to the local Hospital as quickly as they can and burst through into the operating room. All the doctors and nurses are ready to take action when the head surgeon says " I cannot possibly operate on this boy" the other staff look in disbelief, waiting for a reason. "I cannot operate on this boy, as it is my son." How can the boy be the doctors son, bearing in mind that the "dead dad" his is biological father?

[Marvelman]

The surgeon is his mother,

[grasscarp]

The doctor is a woman and is the boys mother.

[saintpeter48]

this one has been doing the rounds for donkeys years