Pointing to a photograph, a woman says, "This mans sons sister is my mother-in-law." How is the womans husband related to the man in the photograph?

Introduction / Context:
This blood relation question connects three generations and requires you to track a chain of relations starting from a man in a photograph, through his children, to the mother-in-law of the speaker. Then you must deduce how the speaker husband is related to the man in the photograph.

Given Data / Assumptions:

• A woman is looking at a photograph of a man.
• She says, "This mans sons sister is my mother-in-law."
• "My mother-in-law" is the mother of the womans husband.
• We assume the usual nuclear family structure with one set of parents for each person.
• The options describe possible relations of the womans husband to the photographed man.

Concept / Approach:
The key is to simplify the phrase "this mans sons sister". The son of the man is his child. The sister of that son is also a child of the same man, therefore his daughter. The sentence then effectively says, "This mans daughter is my mother-in-law." From that point, it becomes a standard grandparent relation problem.

Step-by-Step Solution:
Step 1: Let the man in the photograph be M.Step 2: "Mans son" is a male child of M. Let that son be S.Step 3: "Sons sister" is a female child of M, because both S and his sister are children of M. So this sister is M daughter.Step 4: The woman says that this daughter is her mother-in-law. So M daughter is the mother of the womans husband.Step 5: If M daughter is the mother of the womans husband, then M is the father of that mother. Thus M is the maternal grandfather of the womans husband.Step 6: From the perspective of the womans husband, M is his grandfather. Therefore, the womans husband is the grandson of M.

Verification / Alternative check:
Use example names. Let the man in the photograph be Ramesh. Ramesh has a son Raj and a daughter Sita. Raj and Sita are siblings. The woman says, "This mans sons sister is my mother-in-law." That means Sita is her mother-in-law and is married to some man, and they have a son named Arun, who is the womans husband. Ramesh is then the father of Sita and therefore Aruns grandfather. So Arun, the womans husband, is Ramesh grandson.

Why Other Options Are Wrong:
The womans husband cannot be the son of the man in the photograph, because that would make the mans daughter his sister, not his mother. He is not a son-in-law of the man, since a son-in-law would be married to one of the mans daughters, not be the child of that daughter. Nephew and brother also do not fit, because they do not match the generational distance implied by having the mans daughter as mother-in-law.

Common Pitfalls:
Many candidates get stuck by not simplifying "sons sister" into just "daughter of the same man". Another common mistake is mixing up in-law relations and thinking that mother-in-law must come from the womans side instead of the husbands side. Always remember that mother-in-law is the mother of your spouse, and that automatically places your spouse one generation below her and two generations below her father.

Final Answer:
The womans husband is the grandson of the man in the photograph.