Explanation:

Let’s break this down step by step:

- The family has two married couples. Let's figure out the pairs.

- N is the sister-in-law of S, and N is also the wife of L.

- S is the daughter of M. S also has a sister.

- L is the only son of P.

- I is the son of S’s only brother. That makes L the only brother of S, so I is L's son.

- P is the father of T. M is the spouse of P.

So, the relationships go like this:

- P (father), M (mother) – married couple

- Their kids are L, S, and T (since S has a sister, and L is the son)

- L (P’s only son) is married to N

- I is L and N’s son

- S and T are sisters (since S has a sister, and T is a child of P and M)

- If T gets married to R, what’s the relationship of R to P?

Option 1: Son-in-law – If T is female, R would be the son-in-law.

Option 2: Daughter-in-law – If T is male, R would be the daughter-in-law.

Option 3 and 4 – Not relevant here.

Option 5: None of the above.

Here’s the thing: T is one of the daughters (since S has a sister), so if T (the daughter) marries R, R becomes P’s son-in-law.

Correct answer is Option 1: Son-in-law.