Analyzing the Family Relationship
The question describes a relationship from the woman's perspective. Let's break it down:
- "My only sister": The speaker has exactly one sister.
- "My only sister's mother": Since the speaker and her sister share the same mother, this phrase refers to the speaker's own mother.
- "He is a brother of my only sister's mother": This means the man is the brother of the speaker's mother. Therefore, the man is the woman's maternal uncle.
Determining the Woman's Relation to the Man
The question asks how the woman is related to the man (her maternal uncle).
- If the man is the woman's maternal uncle, then the woman is the daughter of the man's sister (who is the woman's mother).
- The daughter of one's sibling is one's niece.
- Therefore, the woman is the man's niece.
The correct option is Niece.