Solution:

Blood Relations - Introduction:

Blood Relations is a vital topic in Logical Reasoning and is used to solve various problems based on relationships between individuals in a family. It is necessary to understand blood relations and the family tree to solve problems based on this topic.

Given Information:

- Rahul's mother is the only daughter of Monika's father.

To find:

- How is Monika's husband related to Rahul?

Diagram:

To solve this problem, we need to draw a family tree diagram to understand the relationships between individuals in the family.

Let's start by representing Rahul's mother as 'A' and Monika's father as 'B' in the family tree diagram.

Family Tree Diagram:

- A (Rahul's mother)
- B (Monika's father)

Now, we need to identify the relationship between A and B based on the given information.

- Rahul's mother, A, is the only daughter of Monika's father, B.

From this, we can infer that:

- A is the sister of Monika.

Adding this information to our family tree diagram, we get:

Family Tree Diagram:

- B (Monika's father)
\
A (Rahul's mother)

Now, we need to find out how Monika's husband is related to Rahul.

Explanation:

- Monika's husband is the husband of Monika, who is the sister of Rahul's mother.
- Therefore, Monika's husband is Rahul's uncle.

Final Family Tree Diagram:

- B (Monika's father)
\
A (Rahul's mother)
\
C (Monika's husband)

Conclusion:

- Monika's husband is Rahul's uncle.