Question: In a family of six members A, B, C, D, E, and F, there are two married couples. A is a doctor and is married to B. C is the teacher and is the sister of D. E is the father of D and is a lawyer. F is the grandmother of D. Who is the grandfather of D?
Options:
Correct Answer: E
Solution:
E is the father of D, making him the grandfather of D.