There is a family of 6 persons A, B, C, D, E and F. There are two married couples in the family. The family members are lawyer, teacher, salesman, engineer, accountant and doctor. D, the salesman is married to the lady teacher. The doctor is married to the lawyer. F, the accountant is the son of B and brother of E. C, the lawyer is the daughter-in-law of A. E is the unmarried engineer. A is the grandmother of F. How is E related to F?
Cannot be established (cannot be determined)
From the given information, we know the relationships between various family members. However, the exact relationship of E to F is not explicitly mentioned. Since E is the unmarried engineer, and F is the accountant, their precise relationship cannot be definitively concluded from the available information. Thus, the correct answer is (d) Cannot be established.