1. A is the brother of B.
2. C is the father of A.
3. D is the brother of E.
4. E is the daughter of B.
Then, the uncle of D is?
Step-by-step Solution:
\[
\begin{array}{c}
\textbf{C} \quad (\text{Father}) \\
\downarrow \\
\begin{array}{ccc}
\textbf{A} (\text{Male}) & \quad\quad & \textbf{B} (\text{Parent}) \\
& & \downarrow \\
& & \begin{array}{cc}
\textbf{D} (\text{Male)} & \quad \textbf{E} (\text{Female)}
\end{array}
\end{array}
\end{array}
\]
C is the father of A and B.
A (Male) and B (Parent) are siblings.
B has two children: D (Male) and E (Female).
A is the uncle of D.