Introducing Reeta, Monica said, "She is the only daughter of my father's only daughter." How is Monica related to Reeta?

Introduction / Context:
This is a straightforward blood relation problem where the key clue is the phrase my father's only daughter. These questions test if you can correctly identify the speaker's own position in the family and then deduce another person's relation from that. The logic is simple but requires careful reading.

Given Data / Assumptions:

• Monica is speaking and introducing Reeta.
• Monica says Reeta is the only daughter of my father's only daughter.
• Because the speaker is a woman, she is herself a daughter.
• There is only one daughter of Monica's father.

Concept / Approach:
The phrase my father's only daughter can describe only one person: the speaker Monica herself. If there were any other daughter, the father would have more than one daughter. Therefore, my father's only daughter is Monica. The only daughter of that woman is Reeta. So Reeta is the daughter of Monica, which means Monica is the mother of Reeta. That gives the final relation clearly and uniquely.

Step-by-Step Solution:
Step 1: Interpret my father's only daughter. Since Monica is female and a child of her father, she is a daughter of her father.Step 2: The phrase only daughter means Monica has no sister. So this expression points directly to Monica.Step 3: The full description says that Reeta is the only daughter of that person.Step 4: Hence, Reeta is the only daughter of Monica.Step 5: If Reeta is Monica's daughter, then Monica is Reeta's mother.

Verification / Alternative check:
Imagine a family where Monica's father has two daughters. Then my father's only daughter would not make sense, because he would have more than one daughter. So the only consistent interpretation is that Monica is the sole daughter. When she refers to the only daughter of that woman, she is simply referring to her own child. This forces Reeta to be Monica's daughter and not a niece, cousin or granddaughter.

Why Other Options Are Wrong:
Aunt would imply that Reeta is the child of Monica's sibling, which violates the only daughter condition.Niece and cousin both require additional siblings or other branches in the same generation that do not exist here.Grandmother is wrong because it would reverse the generations and also contradict the wording of only daughter.

Common Pitfalls:
Some students overthink the phrase my father's only daughter and try to construct complicated relationships when the simplest reading is correct. Another mistake is to misplace the word only and think it refers to Reeta rather than to the father's daughter. Always anchor such phrases around the closest noun and confirm that the interpretation does not create contradictions in the family structure.

Final Answer:
Monica is related to Reeta as her Mother.