X introduces Y saying, "He is the husband of the grand daughter of the father of my father." How is Y related to X?

Correct option is C

​X says:

"He is the husband of the granddaughter of the father of my father."

Step 2: Interpret each part.

1. "The father of my father":
   This refers to X's grandfather.

2. "The granddaughter of the father of my father":
   This refers to X's sister (since both X and X's sister are the grandchildren of X's grandfather).

3. "He is the husband of the granddaughter":
   Y is the husband of X's sister.

Final Answer:

Y is X's brother-in-law.