There are six persons A, B, C, D, E and F. C is the sister of F. B is the brother of E's husband. D is the father of A and the grandfather of F. There are two fathers, three brothers and a mother in the group. Who is E's husband?

Introduction / Context:

This is a classic, multi-step blood-relation puzzle involving six people and several constraints: two fathers, three brothers, and one mother in the group. The main question is to determine who is E's husband. Solving it requires building a consistent family structure that satisfies all given relational clues at the same time.

Given Data / Assumptions:

• People: A, B, C, D, E and F.
• C is the sister of F (so C is female and F is her sibling).
• B is the brother of E's husband.
• D is the father of A and the grandfather of F.
• In the group, there are exactly two fathers, three brothers and one mother.
• We assume siblings share parents unless otherwise contradicted, and "brother" and "sister" indicate both gender and sibling relation.

Concept / Approach:

The strategy is to use D's role first, because he is explicitly a father and a grandfather. From "D is the father of A and grandfather of F", we know that F is the child of one of D's children. Combining this with "C is the sister of F" and the counts of fathers and brothers, we can deduce who must be the father of F and who fits as E's husband. Finally, the structure must respect the constraints: two fathers, three brothers, and one mother.

Step-by-Step Solution:

Verification / Alternative check:

Check all constraints with this arrangement: D (father of A) and A (father of C and F) are the two fathers. A, B and F are male siblings to someone (A and B to each other; F to C), giving three brothers. E is the mother of C and F, giving exactly one mother. C is the sister of F as required. B is correctly the brother of E's husband, because E's husband is A. No condition is violated, so the family structure is consistent.

Why Other Options Are Wrong:

E cannot be her own husband, so option C is impossible.

C is explicitly a sister, not a husband, and the question asks specifically for "E's husband", so option B is incorrect.

B cannot be E's husband in this structure, because then the "brother of E's husband" statement would become self-referential and would not naturally generate the required set of brothers and fathers.

Common Pitfalls:

Many candidates try to assign the wrong person as the parent of F or ignore the global constraints (two fathers, three brothers, one mother). Always cross-check any trial family structure with all such numerical conditions. If any count fails, the structure must be adjusted. Building a small generational diagram (D at the top, A and B in the middle, C, E and F at the bottom) is often the easiest way to keep everything consistent.

Final Answer:

E's husband is A.