All six members of a family A, B, C, D, E and F are travelling together. B is the son of C, but C is not the mother of B. A and C are a married couple. E is the brother of C. D is the daughter of A. F is the brother of B. Which of the following is a pair of female members of the family?

Introduction / Context:
This question builds on the same six-member family set-up and asks you to identify which pair of people are definitely female. It uses relationship words like son, daughter, brother and married couple to encode gender information. Your task is to decode these clues and pick the option where both listed members must be female.

Given Data / Assumptions:

• B is the son of C, and C is not the mother of B, so C is the father (male) and B is a son (male).
• A and C are a married couple. Since C is male, A is his wife and therefore female.
• E is the brother of C, so E is male.
• D is the daughter of A, so D is female.
• F is the brother of B, so F is male.

Concept / Approach:
The key idea is to first determine the definite gender of each family member using only the information given. Once you know who is male and who is female, you can scan through the options and find the pair for which both members are female. Any option that contains even one definitively male member must be rejected.

Step-by-Step Solution:
Step 1: Assign genders: C is the father (male), B is the son (male), A is the wife of C (female), E is the brother of C (male), D is the daughter of A (female), and F is the brother of B (male).Step 2: Summarise: A and D are female; B, C, E and F are male.Step 3: Evaluate each option:- Option A (A and E): A is female but E is male, so this is not a pair of females.- Option B (B and D): B is male, D is female, so not a pair of females.- Option C (D and F): D is female but F is male, so not correct.- Option D (A and D): both A and D are female, so this fits.- Option E (C and D): C is male and D is female, so not a pair of females.

Verification / Alternative check:
Double-check that there is no hidden ambiguity in genders. The words son, daughter and brother are gender specific, leaving no doubt for B, D, E and F. The phrase C is not the mother of B combined with B is the son of C forces C to be the father. Once C is male, A as the married partner becomes female. No alternative interpretation changes A or D from female to male, so A and D remain the only female pair.

Why Other Options Are Wrong:
Every other option includes at least one male (E, B, F or C), which violates the requirement that both members in the pair must be female.Even if you tried to reassign roles, the fixed gender words son, daughter and brother do not allow such flexibility.

Common Pitfalls:
Some candidates rush and see that A is female and appears in option A and option D, and then pick the first matching option without checking the second person in the pair. Others overlook that E is a brother and therefore male. Always check both names in a pair and make sure each is consistent with the gender clues.

Final Answer:
The only pair in which both members are definitely female is A and D.