Step 1: Understanding the Question:
This is a blood relation problem. We need to trace the family tree backwards from Y to determine the relationship of X to Y based on the given descriptive statement.
Step 2: Detailed Explanation:
Let's break down the complex phrase "the son of Y's son" step by step:
1. "Y's son" refers to a male child of Y in the first generation below Y (let's refer to him as S1).
2. "The son of Y's son" translates to the male child of S1. Since S1 is the son of Y, S1's son represents the second generation below Y, which is the grandson of Y.
Now substitute this simplified relationship back into the first part of the statement:
"X is the brother of [Y's grandson]".
If X is the brother of Y's grandson, then X and the grandson share the same parents (S1 and his spouse).
Therefore, X is also a son of S1.
Since S1 is the direct son of Y, X is consequently the grandson of Y.
Step 3: Final Answer:
X is the grandson of Y.