In a family of six members A, B, C, D, E and F, A and B are a married couple, with A being the male member. D is the only son of C, who is the brother of A. E is the sister of D. B is the daughter-in-law of F, whose husband has died. How is F related to C?

Introduction / Context:
This question uses the same six-member family but now asks you to identify how F is related to C. It combines concepts of daughter-in-law, widowed status and siblings to determine the generational position of F relative to both A and C. By correctly placing F in the family tree, you can deduce whether she is a mother, sister, aunt or some other relative of C.

Given Data / Assumptions:

• A and B are a married couple, with A the male member.
• C is the brother of A, so C is male and a sibling of A.
• D is the only son of C, and E is the sister of D, so D and E are children of C.
• B is the daughter-in-law of F, whose husband has died. Thus, F is a female whose son or daughter is married to B.
• Because A is male and married to B, F must be A's mother (the mother-in-law of B) or A's father's widow.
• Since C is the brother of A, C is another child of F.

Concept / Approach:
The key point is that B is described as the daughter-in-law of F. A daughter-in-law is the wife of one's son, so F must be the mother (or at least the parent) of A. Because A and C are brothers, this also makes F the parent of C. The fact that F's husband has died simply explains why only one older person is mentioned from that generation. Therefore, F is the mother of both A and C, making her the mother of C.

Step-by-Step Solution:
Step 1: Since A and B are a married couple and A is the male member, B is A's wife.Step 2: B is the daughter-in-law of F, whose husband has died. So F is the mother (or parent) of A.Step 3: C is the brother of A, so C and A share parents. Therefore, F is also the parent of C.Step 4: Because F is described as the person whose husband has died, she is a widowed female parent of A and C.Step 5: Altogether, this makes F the mother of C.

Verification / Alternative check:
Sketch the family tree: F and her deceased husband form the older generation. They have at least two sons, A and C. A marries B, making B the daughter-in-law of F. C has children D and E. In this diagram, F is clearly the mother of both A and C. There is no alternative reading of daughter-in-law and widowed husband that would make F a sister, aunt or sister-in-law of C, since those would place her either in the same generation or a collateral branch, not above as a parent.

Why Other Options Are Wrong:
Sister is impossible because F is in the older generation as the mother of A's spouse, not in the same generation as A and C.Aunt would require F to be a sibling of one of C's parents, which would still not make B her direct daughter-in-law.Sister-in-law is incorrect because F is not married to a sibling of C; she is instead the parent of C.Grandmother would place F one generation above C, but she is one generation above D and E, not above C.

Common Pitfalls:
One common confusion is to focus on D and E and mistakenly think of F as their grandmother, forgetting that the question asks about F's relation to C, not to D or E. Another error is misreading daughter-in-law as referring to a more distant relation; in such puzzles it always connects directly to the parent generation of the spouse. Keeping the generational layers clear prevents these mistakes.

Final Answer:
F is related to C as his Mother.