Question

A family has seven members, A, B, C, D, E, F and G. Among them there are three married couples. B, an engineer, is the father of E, who is a student. F, a contractor, is the grandfather of E. C is the daughter-in-law of D, who is a professor. G, a doctor, is the uncle of the student E. Among the seven members there is one journalist, one housewife and one student. C is the sister-in-law of B. The student, E, is single.

Who is C's husband?

• A. B
• B. G
• C. F
• D. Cannot be determined

Hint:

C is D's daughter-in-law and also B's sister-in-law, so C must be married to B's brother, not to B himself.

Answer 1

The Correct Option is B

Step 1: Test option (a), B, first.
If C were B's wife, then C would be E's mother, not E's aunt or sister-in-law. But the clue clearly calls C the sister-in-law of B, not his wife, so this option contradicts the given facts and is ruled out.

Step 2: Test option (c), F.
F is already fixed as the grandfather of E, from the oldest generation. C is described as D's daughter-in-law, which places C one generation below D and F, in the same generation as B. C being married to F, a generation above her, does not fit a daughter-in-law of D's son, so this option is also ruled out.

Step 3: Check whether the answer can be "cannot be determined".
The clues give us enough to fully fix the family: F and D are husband and wife with two sons, B and G; B is married to a woman who becomes E's mother; and C, being D's daughter-in-law who is also B's sister-in-law, must be married to the remaining son, G. Since a definite person can be pinned down, "cannot be determined" is wrong.

Step 4: Confirm option (b), G.
G is the second son of D and F, and marrying C makes C the wife of B's brother, which fits both clues, "daughter-in-law of D" and "sister-in-law of B," at the same time. No other option satisfies both clues together.

Final Answer:
C's husband is G, since he is the only person who fits being both D's son and B's brother. \[ \boxed{\text{G}} \]