Directions: Study the following information carefully and answer the question given below.

K is the niece of P, who is the only brother-in-law of M. M has no siblings. G is the mother of H, who is the mother of K. F has only three children and is married to G. L is the mother of D, who is the grandchild of F.

If H is the wife of M, then how is M related to F?

The correct option is Son-in-law.

Step-by-step breakdown:
1. Identify F and G's children:
- G is the mother of H.
- F is married to G. Therefore, F and G are husband and wife, making F the father of H.

2. Determine the relation between M and F:
- We are given that H is the wife of M (meaning M is the husband of H).
- Since H is the daughter of F, her husband M is the son-in-law of F.

3. Verification of additional details:
- H is the mother of K, so K is the child of M and H.
- P is the brother of H (and brother-in-law of M), making K the niece of P.
- This perfectly matches all given constraints, confirming that M is the Son-in-law of F.