One of Mr. Bajaj, his wife, their son and Mr. Bajaj's mother is an Engineer and another

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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?