A is B’s sister. C is B’s mother. D is C’s father. E is D’s mother. Then how is A related to D

Start with the direct links. C is B's mother and A is B's sister, so A and B are siblings and both are C's children. That makes A the daughter of C.

Next, D is C's father. So D is the father of C, and C is A's mother. Following the chain downward: D to C (child), then C to A (child). A is therefore D's granddaughter.

• A) Grand mother: Wrong. A belongs to the younger generation, not the older one. A grandmother would sit a generation above C.
• B) Grandfather: Wrong. The term describes the older person, so it can only be used for D relative to A. The question asks how A relates to D, and A is the junior, so the term must be granddaughter.
• C) Daughter: Wrong. A is C's daughter, not D's. This is the immediate relation, and it skips the second step of the chain.
• D) Granddaughter: Correct. Two steps down from D through C, and A is female.

The core concept is blood-relation coding, a staple reasoning topic in the UPPSC PCS Prelims paper. The method is to trace one link at a time and fix the generation before the label. Clean logical habits like this also help in Mains answers that need structured, step-wise argument.

Trap: Stopping at the first link (A is C's daughter) and choosing Daughter without tracing the chain up to D.