Interesting Puzzle

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.

Can you tell who is the Doctor and the Engineer?