Pointing to a woman, a girl says, "Her daughter in law is married to the only son of my husband's mother in law." In this blood relation question, how is the girl related to the woman?

Introduction / Context:
This puzzle mixes several in law relations. A girl refers to her husband, her husband's mother in law and the only son of that woman. She then links this son to the daughter in law of the woman she is pointing at. The question is to decide how the girl herself is related to that woman. This kind of problem is common in reasoning tests and often requires converting in law words back to ordinary family relations like mother and son.

Given Data / Assumptions:
• The speaker is a married girl.• Her husband's mother in law is her own mother.• The only son of her mother is her brother.• The daughter in law of the woman being pointed to is married to this only son.• The daughter in law of a woman is the wife of that woman's son.

Concept / Approach:
First, we identify my husband's mother in law. The mother in law of a husband is his wife's mother. Therefore this person is the speaker's mother. The only son of this mother is the speaker's brother. The woman in the question has a daughter in law who is married to this only son. That means the woman's son is that only son, and so the woman is the mother of the speaker's brother. A woman who is mother of a brother of the speaker is also mother of the speaker. Therefore the speaker is the daughter of the woman she is pointing at.

Step-by-Step Solution:
Step 1: Let the speaker be G and her husband be H.Step 2: The mother in law of H is the mother of G, because husband's mother in law is wife's mother.Step 3: The only son of G's mother is G's brother, call him B.Step 4: The statement says the daughter in law of the woman being pointed to is married to this only son B.Step 5: The daughter in law of a woman W is the wife of W's son.Step 6: If W's daughter in law is the wife of B, then W's son is B.Step 7: Since B is already identified as the son of G's mother, the woman W must be that same mother.Step 8: Therefore the woman pointed at is the mother of G.Step 9: From G's perspective, she is the daughter of the woman.

Verification / Alternative check:
Draw the scenario: one woman M has a daughter G and a son B. B is her only son. G marries H. For H, the mother in law is M. The only son of M is B. B marries a woman who then becomes the daughter in law of M. If G says the daughter in law of that woman is married to the only son of my husband's mother in law, she is clearly talking about M as that woman, and B as the son. This confirms that G is the daughter of the woman she points at.

Why Other Options Are Wrong:
Niece of the woman: A niece would be a daughter of a sibling, not of the woman herself.Granddaughter of the woman: A granddaughter would be a child of a son or daughter, one generation lower than G.Cousin of the woman: Cousins are in the same generation and share grandparents, not a parent child link.Sister in law of the woman: A sister in law would be either spouse of a sibling or sibling of a spouse, not a direct child.

Common Pitfalls:
The chief difficulty is interpreting my husband's mother in law correctly as my own mother and then correctly tracking who the only son is. Some candidates confuse the role of daughter in law and treat her as a child instead of a spouse. Keeping aware that daughter in law always means wife of a son clarifies the structure quickly and leads to the realisation that the woman must be the speaker's mother.

Final Answer:
The girl is the daughter of the woman she is pointing at.