Given F is a psychologist.
B is the mother of F and E is the brother or sister of F.
There are only two married couples in the family. Since, D is married to A, so C, the jeweller, who is married to a lawyer, will be married to B.
Again, the Manager D is married to A means A is the doctor and Grandfather of F and E.
Also, no one else is an Engineer. So, E must be an Engineer.

Clearly, A is the grandfather of F and E is the brother or sister of F.
So, A is the grandfather of E. Hence, the answer is (d).