You gave a beautiful girl a lift and she faints in your car,
you quickly drive to the hospital and the doctor says she is pregnant and congratulates you.
You say you are not the father and she says you are the father, :
you request for a DNA test and after the results the doctor says you are not the father because you are infertile. Glad and relieved you leave the hospital.
On your way home you remember that you have 3 children at home.
WHO IS THEIR FATHER?