If A $ B means A is the brother of B; A @ B means A is the wife of B; A # B means A is the daughter of B and A * B means A is the father of B, which of the following indicates that U is the father-in-law of P?

P @ Q $ T # U * W
P @ W $ Q * T # U
P @ Q $ W * T # U
P @ Q $ T # W * U

The correct answer is $\boxed{\text{C.}}$

To solve this question, we need to understand the meaning of each relationship symbol.

  • $A $ B means A is the brother of B.
  • $A @ B means A is the wife of B.
  • $A # B means A is the daughter of B.
  • $A * B means A is the father of B.

Given this information, we can eliminate options A and B immediately. In option A, $U$ is the father of $W$, but there is no indication that $W$ is the wife of $P$. In option B, $U$ is the father of $Q$, but there is no indication that $Q$ is the daughter of $P$.

In option C, $U$ is the father of $T$, and $T$ is the wife of $P$. This satisfies the condition that $U$ is the father-in-law of $P$.

In option D, $U$ is the father of $T$, and $T$ is the daughter of $W$. This does not satisfy the condition that $U$ is the father-in-law of $P$.

Therefore, the correct answer is $\boxed{\text{C.}}$