Neelam, who is Deepak's daughter, says to Deepika, "Your mother Rekha is the younger sister of my father, who is the third child of Ramlal." How is Ramlal related to Deepika?

Introduction / Context:
This question describes a chain of relations involving Neelam, her father Deepak, Deepika, her mother Rekha and an elder Ramlal. You must use these relationships to find how Ramlal is related to Deepika. The key idea is that Rekha and Deepak are siblings, both being children of Ramlal, and that Deepika is Rekha's daughter.

Given Data / Assumptions:
- Neelam is Deepak's daughter. - Deepika's mother is Rekha. - Rekha is the younger sister of Deepak. - Deepak is the third child of Ramlal. - We assume Rekha is also a child of Ramlal, as she is Deepak's sister. - Deepika is the daughter of Rekha.

Concept / Approach:
Because Rekha and Deepak are siblings, they share the same parent(s). Deepak is stated to be the third child of Ramlal, so Ramlal is one of Deepak's parents. Therefore, Ramlal is also a parent of Rekha. Once we know that Rekha is a daughter of Ramlal and Deepika is the daughter of Rekha, it follows that Ramlal is Deepika's grandfather. The question asks specifically about Ramlal's relationship to Deepika, not vice versa.

Step-by-Step Solution:
Step 1: Neelam says: Your mother Rekha is the younger sister of my father. So Rekha and Deepak are siblings. Step 2: If Rekha is the younger sister of Deepak, then they share at least one parent in common. Step 3: Deepak is described as the third child of Ramlal. That means Deepak is a child of Ramlal. Step 4: Since Rekha is Deepak's sister, it is natural in this exam context to treat Rekha as another child of Ramlal. Step 5: Deepika's mother is Rekha, so Deepika is the granddaughter of Ramlal through Rekha. Step 6: Therefore, Ramlal is Deepika's grandfather.

Verification / Alternative check:
Draw a family tree: At the top is Ramlal. In the next generation are his children, including Deepak (third child) and Rekha (younger sister of Deepak). In the next generation, from Rekha we place Deepika as her daughter; from Deepak we place Neelam as his daughter. Comparing levels, Ramlal is two generations above Deepika, so from Deepika's viewpoint, he is her grandfather. This matches the text and satisfies all given relationships.

Why Other Options Are Wrong:
- Uncle: An uncle would be the brother of one's parent, not the parent of one's parent. - Father: Deepika's father is not mentioned; Rekha is her mother. Ramlal is the father of Rekha, not of Deepika. - Father-in-law: That would be the father of Deepika's husband and involves a different generation and marriage link, not described here. - Brother: A brother would be in the same generation as Deepika, which Ramlal clearly is not.

Common Pitfalls:
Some students misread the phrase third child of Ramlal as meaning that Ramlal is a child of someone else and confuse generations. Another mistake is to assume that Rekha might be a daughter-in-law instead of a daughter, but the line younger sister of my father clearly signals a sibling relationship, not an in-law relationship. Keeping generations straight and noticing who is the parent of whom prevents these errors.

Final Answer:
Ramlal is Deepika's grandfather.