Response to the following problem:
One of Mr. Bajaj, his wife, their son and Mr. Bajaj's mother is an Engineer and another is a Doctor.
* If the Doctor is a male, then the Engineer is a male.
* If the Engineer is younger than the Doctor, then the Engineer and the Doctor are not blood relatives.
* If the Engineer is a female, then she and the Doctor are blood relatives. Who is the Doctor and the Engineer?