Study the following information carefully and answer the questions given below.

There are seven members in a family. There is no single parent. P is the only daughter of S. M is the grandmother of X. K is the brother-in-law of B. S is the husband of M. A is the only niece of B.

How K is related to A?

The correct answer is Father.

Let's analyze the given information step-by-step to deduce the family tree:

1. "S is the husband of M" and "M is the grandmother of X":
S (Male) is married to M (Female). Together, S and M represent the first (grandparent) generation.

2. "P is the only daughter of S":
Since S and M are married, P is the daughter of S and M.

3. "There are seven members in a family. There is no single parent.":
Since there are no single parents, any member who has children must be married.

4. "K is the brother-in-law of B" and "A is the only niece of B":
A is a female of the third generation (niece of B, grandchild of S and M).
For A to be the niece of B, A's parent must be a sibling of B.
Since P is the only daughter of S and M, B must be a son of S and M (a male).
P (female) and B (male) are siblings, children of S and M.
Since B is unmarried or has no children mentioned, P must be married to K. Thus, K is the brother-in-law of B.
Therefore, P (Female) and K (Male) are married to each other, forming a couple in the second generation.

5. Children of K and P:
K and P's children are A (Female, the niece of B) and X (the grandchild of M).
This accounts for all 7 members: S, M, P, B, K, A, and X.

6. Relation of K to A:
Since K and P are the parents of A, K is the Father of A.